Location: Mahalo Trail

The main Legendary Pokémon in the games are actually ones that have been with your travelling companion, Lillie, all throughout the game. Starting out as the Cosmog you rescue on the Mahalo Trail, it grows attached to you. Once kidnapped by the Aether Foundation, it evolves into Cosmoem and sends Lusamine to Ultra Space. Lillie asks you to go find the Legendary Pokémon in order to create a portal to get her back. However, when doing so, Cosmoem goes into the beam that summons it and evolves into Solgaleo or Lunala depending on the version and then gets absorbed into Necrozma and goes through to Ultra Megalopolis. Upon saving it, Lillie and Lusamine take it back to the Aether Foundation as it's weak, but after you encounter Gladion at Mount Lanakila, he will mention that Lillie is on Mahalo Trail. When you go there, she'll be there with Nebby and say that as she's not a trainer, it's best if you take it with you. You can then challenge it to a battle

Solgaleo Level 60

OT: Yours ID: Yours Ability: Full Metal Body Hold Item: None

??? Nature. Date of Receiving Mahalo Trail. Caught at Lv. 60

Sunsteel Strike Cosmic Power Crunch Zen Headbutt

Lunala Level 60

OT: Yours ID: Yours Ability: Shadow Shield Hold Item: None

??? Nature. Date of Receiving Mahalo Trail. Caught at Lv. 60

Moongeist Beam Cosmic Power Night Daze Shadow Ball

Location: Altar of the Sunne/Moone, Ultra Megalopolis, Mount Lanakila

Necrozma is the cover star of the games and is one of the more mysterious Pokémon. Necrozma is a Pokémon that in legends steals the light. Once it tried to steal the light from Alola until it was pushed back by the Guardian Deities. Due to this, it explored Ultra Space and came to Ultra Megaopolis where it stole the light, but the people there managed to restrain it. However, as its strength kept growing, the Ultra Recon Squad went exploring other worlds to find ways to stop it. This made Lusamine desire to open Ultra Wormholes to go there to stop it. However, when she does and you go to restore Nebby, Necrozma opens an Ultra Wormhole and fuses with Nebby. You battle it here, but can't capture it.

Necrozma Level 50

OT: Yours ID: Yours Ability: Prism Armor Hold Item: None

Sunsteel Strike Morning Sun Psycho Cut Night Slash

Necrozma Level 50

OT: Yours ID: Yours Ability: Prism Armor Hold Item: None

Moongeist Beam Moonlight Psychic Power Gem

After this, you go to Ultra Megalopolis to try and stop it. As you reach the top of Megalo Tower, you will find Necrozma reaching its Ultra Burst and becoming Ultra Necrozma, its ultimate form. You then battle it here where all its stats are boosted by aura, but it once again cannot be captured.

Necrozma Level 60

OT: Yours ID: Yours Ability: Neuroforce Hold Item: None

Photon Geyser Smart Strike Power Gem Dragon Pulse

After defeating it and saving Alola, you'll then learn that Necrozma has fallen through to another world, but without specification. When you climb Mount Lanakila towards the Pokémon League, you will discover Necrozma weakened in a crater. Interact with it and it'll ask if you'll share some light from your Z-Ring with it. Accept and it'll become well enough to battle. Here is where you can capture it. Defeat it and you'll find the Ultranecrozium Z

Necrozma Level 65

OT: Yours ID: Yours Ability: Prism Armor Hold Item: Ultranecrozium Z

??? Nature. Date of Receiving Mount Lanakila. Caught at Lv. 65

Photon Geyser Iron Defense Power Gem Night Slash

Location: Lake of the Sunne (Ultra Sun), Lake of the Moone (Ultra Moon)

With the Cosmog you befriended in the game having evolved into the Solgaleo & Lunala, you can get another Cosmog. This Legendary Pokémon, while technically an Ultra Beast, is a rather complex one to get. After you have defeated the Elite Four, when it turns to Night in Sun or Day in Moon, you can return to the Altar of the Sunne/Moone with Solgaleo/Lunala in your team respectively and you'll be able to go to the Reverse World, where it is back to Day/Night depending on your game. Then, go to the Lake of the Sunne or Lake of the Moone from Ula'ula Meadow and reach the altar, with Solgaleo/Lunala still in your party. Cosmog will then appear. You don't need to battle it, it will join you automatically..

Cosmog Level 5

OT: Yours ID: Yours Ability: Unaware Hold Item: None

??? Nature. Date of Receiving Lake of the Sunne/Lake of the Moone. Caught at Lv. 5

Splash

Location: Resolution Cave

After you have defeated the Elite Four and become champion, you will see a scene of Zygarde moving around a cave. Go to Resolution Cave on Poni Island and you'll find Zygarde there, waiting for battle. This can later be assembled further with cells from Dexio and Sina in Route 16 to make a Zygarde with Power Construct in order to be able to become Complete Forme.

Zygarde Level 60

OT: Yours ID: Yours Ability: Aura Break Hold Item: None

??? Nature. Date of Receiving Resolution Cave. Caught at Lv. 60

Land's Wrath Glare Safeguard Dragon Breath

Location: Ruins of Conflict

After you have defeated the Elite Four and become champion, you will see a scene of Tapu Koko calling to you. Go to the Ruins of Conflict and interact with the statue at the altar and you can battle Tapu Koko. You will get the Tapunium Z after battling it.

Tapu Koko Level 60

OT: Yours ID: Yours Ability: Electric Surge Hold Item: None

??? Nature. Date of Receiving Ruins of Conflict. Caught at Lv. 60

Nature's Madness Discharge Agility Electro Ball

Location: Ruins of Life

After you have defeated the Elite Four and become champion, go to the Ruins of Life on Akala Island and interact with the statue at the altar and you can battle Tapu Lele.

Tapu Lele Level 60

OT: Yours ID: Yours Ability: Psychic Surge Hold Item: None

??? Nature. Date of Receiving Ruins of Life. Caught at Lv. 60

Nature's Madness Extrasensory Flatter Moonblast

Location: Ruins of Abundace

After you have defeated the Elite Four and become champion, go to the Ruins of Abundance on Ula'ula Island and interact with the statue at the altar and you can battle Tapu Bulu.

Tapu Bulu Level 60

OT: Yours ID: Yours Ability: Grassy Surge Hold Item: None

??? Nature. Date of Receiving Ruins of Abundance. Caught at Lv. 60

Nature's Madness Zen Headbutt Megahorn Skull Bash

Location: Ruins of Hope

After you have defeated the Elite Four and become champion, go to the Ruins of Hope on Poni Island and interact with the statue at the altar and you can battle Tapu Fini.

Tapu Fini Level 60

OT: Yours ID: Yours Ability: Misty Surge Hold Item: None

??? Nature. Date of Receiving Ruins of Hope. Caught at Lv. 60

Nature's Madness Muddy Water Aqua Ring Hydro Pump

Location: Ultra Space Wilds
Wormhole Colour: Red
Additional Requirements: None

Articuno Level 60

OT: Yours ID: Yours Ability: Pressure Hold Item: None

??? Nature. Date of Receiving Ultra Space Wilds. Caught at Lv. 60

Ancient Power Freeze-Dry Reflect Hail

Location: Ultra Space Wilds
Wormhole Colour: Red
Additional Requirements: None

Zapdos Level 60

OT: Yours ID: Yours Ability: Pressure Hold Item: None

??? Nature. Date of Receiving Ultra Space Wilds. Caught at Lv. 60

Ancient Power Discharge Pluck Rain Dance

Location: Ultra Space Wilds
Wormhole Colour: Red
Additional Requirements: None

Moltres Level 60

OT: Yours ID: Yours Ability: Pressure Hold Item: None

??? Nature. Date of Receiving Ultra Space Wilds. Caught at Lv. 60

Ancient Power Flamethrower Air Slash Sunny Day

Location: Ultra Space Wilds
Wormhole Colour: Green
Additional Requirements: None

Mewtwo Level 60

OT: Yours ID: Yours Ability: Pressure Hold Item: None

??? Nature. Date of Receiving Ultra Space Wilds. Caught at Lv. 60

Psychic Recover Swift Psycho Cut

Location: Ultra Space Wilds
Wormhole Colour: Green
Game: Ultra Sun Only
Additional Requirements: None

Raikou Level 60

OT: Yours ID: Yours Ability: Pressure Hold Item: None

??? Nature. Date of Receiving Ultra Space Wilds. Caught at Lv. 60

Reflect Crunch Thunder Fang Discharge

Location: Ultra Space Wilds
Wormhole Colour: Green
Game: Ultra Moon Only
Additional Requirements: None

Entei Level 60

OT: Yours ID: Yours Ability: Pressure Hold Item: None

??? Nature. Date of Receiving Ultra Space Wilds. Caught at Lv. 60

Stomp Bite Swagger Lava Plume

Location: Ultra Space Wilds
Wormhole Colour: Blue
Additional Requirements: Both Raikou & Entei on your team

Suicune Level 60

OT: Yours ID: Yours Ability: Pressure Hold Item: None

??? Nature. Date of Receiving Ultra Space Wilds. Caught at Lv. 60

Bubble Beam Aurora Beam Mist Rain Dance

Location: Ultra Space Wilds
Wormhole Colour: Blue
Game: Ultra Moon Only
Additional Requirements: None

Lugia Level 60

OT: Yours ID: Yours Ability: Pressure Hold Item: None

??? Nature. Date of Receiving Ultra Space Wilds. Caught at Lv. 60

Skill Swap Aeroblast Extrasensory Ancient Power

Location: Ultra Space Wilds
Wormhole Colour: Red
Game: Ultra Sun Only
Additional Requirements: None

Ho-Oh Level 60

OT: Yours ID: Yours Ability: Pressure Hold Item: Sacred Ash

??? Nature. Date of Receiving Ultra Space Wilds. Caught at Lv. 60

Burn Up Sacred Fire Extrasensory Ancient Power

Location: Ultra Space Wilds
Wormhole Colour: Yellow
Additional Requirements: None

Regirock Level 60

OT: Yours ID: Yours Ability: Clear Body Hold Item: None

??? Nature. Date of Receiving Ultra Space Wilds. Caught at Lv. 60

Stone Edge Hammer Arm Lock-On Zap Cannon

Location: Ultra Space Wilds
Wormhole Colour: Yellow
Additional Requirements: None

Regice Level 60

OT: Yours ID: Yours Ability: Clear Body Hold Item: None

??? Nature. Date of Receiving Ultra Space Wilds. Caught at Lv. 60

Ice Beam Hammer Arm Lock-On Zap Cannon

Location: Ultra Space Wilds
Wormhole Colour: Yellow
Additional Requirements: None

Registeel Level 60

OT: Yours ID: Yours Ability: Clear Body Hold Item: None

??? Nature. Date of Receiving Ultra Space Wilds. Caught at Lv. 60

Flash Cannon Hammer Arm Lock-On Zap Cannon

Location: Ultra Space Wilds
Wormhole Colour: Blue
Game: Ultra Moon Only
Additional Requirements: None

Latias Level 60

OT: Yours ID: Yours Ability: Levitate Hold Item: None

??? Nature. Date of Receiving Ultra Space Wilds. Caught at Lv. 60

Mist Ball Dragon Pulse Psycho Shift Wish

Location: Ultra Space Wilds
Wormhole Colour: Blue
Game: Ultra Sun Only
Additional Requirements: None

Latios Level 60

OT: Yours ID: Yours Ability: Levitate Hold Item: None

??? Nature. Date of Receiving Ultra Space Wilds. Caught at Lv. 60

Luster Purge Dragon Pulse Psycho Shift Dragon Breath

Location: Ultra Space Wilds
Wormhole Colour: Blue
Game: Ultra Moon Only
Additional Requirements: None

Kyogre Level 60

OT: Yours ID: Yours Ability: Drizzle Hold Item: None

??? Nature. Date of Receiving Ultra Space Wilds. Caught at Lv. 60

Ice Beam Origin Pulse Calm Mind Muddy Water

Location: Ultra Space Wilds
Wormhole Colour: Yellow
Game: Ultra Sun Only
Additional Requirements: None

Groudon Level 60

OT: Yours ID: Yours Ability: Drought Hold Item: None

??? Nature. Date of Receiving Ultra Space Wilds. Caught at Lv. 60

Earthquake Precipice Blades Bulk Up Solar Beam

Location: Ultra Space Wilds
Wormhole Colour: Red
Additional Requirements: Requires both Kyogre & Groudon in your team

Rayquaza Level 60

OT: Yours ID: Yours Ability: Air Lock Hold Item: None

??? Nature. Date of Receiving Ultra Space Wilds. Caught at Lv. 60

Rest Extreme Speed Dragon Pulse Dragon Dance

Location: Ultra Space Wilds
Wormhole Colour: Blue
Additional Requirements: None

Uxie Level 60

OT: Yours ID: Yours Ability: Levitate Hold Item: None

??? Nature. Date of Receiving Ultra Space Wilds. Caught at Lv. 60

Extrasensory Yawn Amnesia Swift

Location: Ultra Space Wilds
Wormhole Colour: Blue
Additional Requirements: None

Mesprit Level 60

OT: Yours ID: Yours Ability: Levitate Hold Item: None

??? Nature. Date of Receiving Ultra Space Wilds. Caught at Lv. 60

Extrasensory Charm Future Sight Swift

Location: Ultra Space Wilds
Wormhole Colour: Blue
Additional Requirements: None

Azelf Level 60

OT: Yours ID: Yours Ability: Levitate Hold Item: None

??? Nature. Date of Receiving Ultra Space Wilds. Caught at Lv. 60

Extrasensory Nasty Plot Uproar Swift

Location: Ultra Space Wilds
Wormhole Colour: Green
Game: Ultra Sun Only
Additional Requirements: None

Dialga Level 60

OT: Yours ID: Yours Ability: Pressure Hold Item: None

??? Nature. Date of Receiving Ultra Space Wilds. Caught at Lv. 60

Aura Sphere Iron Tail Roar of Time Flash Cannon

Location: Ultra Space Wilds
Wormhole Colour: Yellow
Game: Ultra Moon Only
Additional Requirements: None

Palkia Level 60

OT: Yours ID: Yours Ability: Pressure Hold Item: None

??? Nature. Date of Receiving Ultra Space Wilds. Caught at Lv. 60

Aura Sphere Aqua Tail Spacial Rend Hydo Pump

Location: Ultra Space Wilds
Wormhole Colour: Yellow
Game: Ultra Sun Only
Additional Requirements: None

Heatran Level 60

OT: Yours ID: Yours Ability: Flash Fire Hold Item: None

??? Nature. Date of Receiving Ultra Space Wilds. Caught at Lv. 60

Crunch Scary Face Lava Plume Fire Spin

Location: Ultra Space Wilds
Wormhole Colour: Yellow
Game: Ultra Moon Only
Additional Requirements: None

Regigigas Level 60

OT: Yours ID: Yours Ability: Slow Start Hold Item: None

??? Nature. Date of Receiving Ultra Space Wilds. Caught at Lv. 60

Zen Headbutt Revenge Dizzy Punch Confuse Ray

Location: Ultra Space Wilds
Wormhole Colour: Yellow
Additional Requirements: Requires both Dialga & Palkia on your team

Giratina Level 60

OT: Yours ID: Yours Ability: Pressure Hold Item: None

??? Nature. Date of Receiving Ultra Space Wilds. Caught at Lv. 60

Shadow Force Aura Sphere Earth Power Dragon Claw

Location: Ultra Space Wilds
Wormhole Colour: Red
Additional Requirements: None

Cresselia Level 60

OT: Yours ID: Yours Ability: Levitate Hold Item: None

??? Nature. Date of Receiving Ultra Space Wilds. Caught at Lv. 60

Aurora Beam Future Sight Slash Moonlight

Location: Ultra Space Wilds
Wormhole Colour: Green
Additional Requirements: None

Cobalion Level 60

OT: Yours ID: Yours Ability: Justified Hold Item: None

??? Nature. Date of Receiving Ultra Space Wilds. Caught at Lv. 60

Sacred Sword Swords Dance Quick Attack Iron Head

Location: Ultra Space Wilds
Wormhole Colour: Green
Additional Requirements: None

Terrakion Level 60

OT: Yours ID: Yours Ability: Justified Hold Item: None

??? Nature. Date of Receiving Ultra Space Wilds. Caught at Lv. 60

Sacred Sword Swords Dance Rock Slide Stone Edge

Location: Ultra Space Wilds
Wormhole Colour: Green
Additional Requirements: None

Virizion Level 60

OT: Yours ID: Yours Ability: Justified Hold Item: None

??? Nature. Date of Receiving Ultra Space Wilds. Caught at Lv. 60

Sacred Sword Swords Dance Giga Drain Leaf Blade

Location: Ultra Space Wilds
Wormhole Colour: Red
Game: Ultra Sun Only
Additional Requirements: None

Tornadus Level 60

OT: Yours ID: Yours Ability: Prankster Hold Item: None

??? Nature. Date of Receiving Ultra Space Wilds. Caught at Lv. 60

Air Slash Crunch Tail Wind Rain Dance

Location: Ultra Space Wilds
Wormhole Colour: Red
Game: Ultra Moon Only
Additional Requirements: None

Thundurus Level 60

OT: Yours ID: Yours Ability: Prankster Hold Item: None

??? Nature. Date of Receiving Ultra Space Wilds. Caught at Lv. 60

Discharge Crunch Charge Nasty Plot

Location: Ultra Space Wilds
Wormhole Colour: Green
Game: Ultra Sun Only
Additional Requirements: None

Reshiram Level 60

OT: Yours ID: Yours Ability: Turboblaze Hold Item: None

??? Nature. Date of Receiving Ultra Space Wilds. Caught at Lv. 60

Slash Extrasensory Fusion Flare Dragon Pulse

Location: Ultra Space Wilds
Wormhole Colour: Green
Game: Ultra Moon Only
Additional Requirements: None

Zekrom Level 60

OT: Yours ID: Yours Ability: Teravolt Hold Item: None

??? Nature. Date of Receiving Ultra Space Wilds. Caught at Lv. 60

Slash Zen Headbutt Fusion Bolt Dragon Claw

Location: Ultra Space Wilds
Wormhole Colour: Red
Additional Requirements: Requires Tornadus & Thundurus on your team

Landorus Level 60

OT: Yours ID: Yours Ability: Sand Force Hold Item: None

??? Nature. Date of Receiving Ultra Space Wilds. Caught at Lv. 60

Earth Power Rock Slide Earthquake Sandstorm

Location: Ultra Space Wilds
Wormhole Colour: Blue
Additional Requirements: Requires Reshiram & Zekrom on your team

Kyurem Level 60

OT: Yours ID: Yours Ability: Pressure Hold Item: None

??? Nature. Date of Receiving Ultra Space Wilds. Caught at Lv. 60

Slash Scary Face Glaciate Dragon Pulse

Location: Ultra Space Wilds
Wormhole Colour: Green
Game: Ultra Sun Only
Additional Requirements: None

Xerneas Level 60

OT: Yours ID: Yours Ability: Fairy Aura Hold Item: None

??? Nature. Date of Receiving Ultra Space Wilds. Caught at Lv. 60

Geomancy Horn Leech Night Slash Moonblast

Location: Ultra Space Wilds
Wormhole Colour: Red
Game: Ultra Moon Only
Additional Requirements: None

Yveltal Level 60

OT: Yours ID: Yours Ability: Dark Aura Hold Item: None

??? Nature. Date of Receiving Ultra Space Wilds. Caught at Lv. 60

Oblivion Wing Dark Pulse Phantom Force Psychic