Gyms are to Pokemon what fortresses are to Mario: a place to test the skills you've picked up on your journey through the overworld with a boss at the end. Spread out across eight cities, there are nine gyms and eight badges to be collected, with the other gym offering a rare Pokemon instead. Your goal is to beat all the gyms so you can move on to the Elite Four, the gang who will face you in the endgame before the final boss. Most gyms have puzzles you'll have to overcome as well; typically, they have to do with the type of Pokemon the gym specializes in and require a bit of brainpower to best. Good luck!

Gym #1 - Pewter City Gym

Location: Pewter City
Gym Leader: Brock
Specialty: Rock-type
Reward: Boulder Badge, TM34, Can use HM05 - Flash

Puzzle:
This gym is fairly straightforward, with a direct walk to the leader. The only trainer in the gym uses two Ground-types, Sandshrew and Diglett, while the leader Brock uses Rock-types. Beware of his specialty move Bide, which absorbs damage for two to three turns then deals it back double to the enemy. Onix can be a bit of a pain since it's probably at a higher level than anything you have, and has decent defense. Pikachu's Electric-type moves are useless on the secondary Ground-typing of the duo, and thus may need to call in help from an ally like Butterfree. Naturally, the parting gift from Brock is TM34 Bide. You can now use Flash outside of battle.

Gym Leader Brock GeodudeOnix
Battle Type
Single Battle
Items
Level 10Level 12
Attacks:
Tackle
Attacks:
Tackle
Screech
Bide
Bind
Gym #2 - Cerulean City Gym

Location: Cerulean City
Gym Leader: Misty
Specialty: Water-type
Reward: Cascade Badge, TM31, Can use HM01 - Cut

Puzzle:
Two trainers will challenge you on the way to Misty, one of whom you can skip. The other, who must be faced, has a Goldeen with the powerful Horn Attack move, so watch out. Again, we have a straightforward path to the Leader, along a pool filled with water. Later in the game you can come back and fish for Pokemon in the water if you so please. As for Misty herself, she uses two Pokemon from the same family - Staryu and Starmie. Staryu can be taken out no problem but Starmie will be a pain as Misty likes to use X Special on it in the beginning. It'll sometimes try to use Harden to raise its Defense as well, so get it out of the way fast. Ivysaur and Pikachu both have awesome type coverage over it, Butterfree can use Stun Spore or Sleep Powder to dispatch it, and Clefairy or Jigglypuff can learn Thunder Wave by TM to paralyze it. Starmie likes to use Bubblebeam once it's set up, which can reduce Speed, so watch out. Though the move isn't terribly powerful it can be annoying when Starmie has +1 and already boasts incredible base Special as is. The secondary prize from her is TM11 Bubblebeam. You can now use Cut outside of battle.

Gym Leader Misty StaryuStarmie
Battle Type
Single Battle
Items
Level 18Level 21
Attacks:
Tackle
Water Gun
Attacks:
Tackle
Water Gun
Harden
Bubblebeam
Gym #3 - Vermillion City Gym

Location: Vermillion City
Gym Leader: Lt. Surge
Specialty: Electric-type
Reward: Thunder Badge, TM24, Can use HM02 - Fly

Puzzle:
To get to the gym you first need to have acquired Cut from the S.S. Anne to knock down the bush blocking the path. This electrifying gym has an interesting novelty - you need to check for two switches hidden in the garbage cans to open the automatic doors. The second is always next to the first, be it the can north, south, east, or west, but will be difficult anyways to find as the locks reset if you click on the wrong can. The trainers are all fairly easy to beat, however you made need to heal a few times should your Pokemon become paralyzed. Lt. Surge himself isn't that hard with the right Pokemon. Raichu, his only Pokemon, absolutely hates Rock/Ground-type Pokemon, such as Graveller. If you caught a Nidoran and it's now either Nidorino or Nidorina, you may wish to consider the final stage of evolution via Moon Stone to gain the Ground-type immunity to Electric. If not, Diglett's Cave is east of Vermilion and you can nab the elusive Diglett or its evolution Dugtrio to give you a hand. Watch for Mega Punch and Mega Kick, however, as Dugtrio really can't afford to take the hit. Raichu is extremely dangerous without a type immunity to Electric due to its Thunderbolt attack (which has the highest base power of any move yet in the game), so take incredible caution. The prize for this match is TM24 Thunderbolt. You can now use Fly outside of battle.

Gym Leader Lt. Surge Raichu
Battle Type
Single Battle
Items
Level 28
Attacks:
Thunderbolt
Thunderbolt Growl
Mega Punch

Mega Kick
Gym #4 - Celadon City Gym

Location: Celadon City
Gym Leader: Erika
Specialty: Grass-type
Reward: Rainbow Badge, TM21, Can use HM04 - Strength

Puzzle:
Erika's gym requires Cut! The gimmick in this gym isn't actually that hard, just cut down trees to open the path to the leader. The gym trainers might force you to go back to the Pokemon Center a few times because of status conditions - stock up on healing items at the fabulous Celadon Department Store. Ultimately you don't need to fight all the trainers; 3 or 4 will do to be gain access to Erika depending on the path chosen. The battle with Erika might be tough but Flareon will prove to be a worthwhile choice in Eeveelution - attacks like Fire Spin will burn down her team. Alternatively, you should have a Charmeleon by now if you took Charmander, and that'll be a great asset for this match. Be careful of Tangela's Bind: in this generation you won't be able to move while it's in use and if she's faster than you you're out of luck. Her Gloom uses the ultra-strong Petal Dance, rather than Mega Drain like in Red and Blue (though that is still handed out via TM21). If you have Psychic-type moves on a Kadabra or Drowzee, I suggest breaking them out for Gloom and Weepinbell. After winning, you can use Strength outside of battle.

Gym Leader Erika WeepinbellTangela Gloom
Battle Type
Single Battle
Items
Level 32Level 30Level 32
Attacks:
Wrap
Stun Sporte
Sleep Powder
Razor Leaf
Attacks:
Bind
Mega Drain
Vine Whip
Constrict
Attacks:
Acid
Petal Dance
Stun Spore
Sleep Powder
Gym #5 - Fuchsia City Gym

Location: Fuchsia City
Gym Leader: Koga
Specialty: Poison-type
Reward: Soul Badge, TM06, Can use HM03 - Surf

Puzzle:
Koga's gym is a maze of invisible walls. The floor that appears like dotted lines will always be solid so navigate through the floor where the lines are continued. The gym trainers are peculiar here, using a mix of Ground, Psychic, and Poison-types, despite only the former being used by Koga himself. Koga's team is basically three Venonats and a Venomoth, though the level spike from Erika to Koga is insane. Despite this, all four Pokemon rely on Toxic, which badly poisons you, to win. Even with Psychic their stats are too low to be a threat otherwise. The prize for this match is TM06 Toxic. If you have Venusaur, give it Leech Seed and Toxic as the effects of both in this generation will stack in a way that your enemies die much faster. After this match you can use Surf, the last of the HM moves which can be found at the back house of the Safari Zone.

Gym Leader Koga VenonatVenonatVenonat Venomoth
Battle Type
Single Battle
Items
Level 44Level 46Level 48Level 50
Attacks:
Tackle
Toxic
Sleep Powder
Psychic
Attacks:
Toxic
Psybeam
Supersonic
Psychic
Attacks:
Toxic
Psychic
Sleep Powder
Double-Edge
Attacks:
Toxic
Psychic
Leech Life
Double Team
Gym #6 - Saffron City Gym

Location: Saffron City
Gym Leader: Sabrina
Specialty: Psychic-type
Reward: Marsh Badge, TM46

Puzzle:
Only accessible after the Rockets have been defeated, Sabrina's gym is a network of, you guessed it, teleporters. Have fun trying to navigate through this mess. Here's a hint - you will need to battle a few of the trainers, who use a combination of Psychic-types and Ghost-types. Slowbro and Mr. Mime are both favourite choices amongst the trainers. Sabrina's team itself uses three pure Psychic-types - the Abra family! Abra has no attacking moves and you can switch out when it Flashes, but the other two have very high Special and can hit hard with Psychic-type moves. This trio has horrid defenses so try to use attacks that fall under the physical category of types, but watch out - Alakazam is very fast and will use Reflect for support to double its defense. The TM for this match is TM46 Psywave, a move that randomly multiplies the enemies level and damages it accordingly.

Gym Leader Sabrina AbraKadabra Alakazam
Battle Type
Single Battle
Items
Level 50Level 50Level 50
Attacks:
Teleport
Flash
Attacks:
Psychic
Recover
Kinesis
Psywave
Attacks:
Psychic
Psywave
Reflect
Recover
Gym #7 - Cinnabar Island Gym

Location: Cinnabar Island
Gym Leader: Blaine
Specialty: Fire-type
Reward: Volcano Badge, TM38

Puzzle:
After finding the hidden key to the Cinnabar Gym in Cinnabar Mansion, you'll be able to take a crack at Blaine's Fire-type madness. The gym puzzle is fairly straightforward - talk to the computers in the corner to be asked a question, and answer it right to move ahead. If you answer it wrong or don't want to do it at all, you'll have to fight the trainers to open the door. They use powerful Fire-types such as Ninetales and Charmander to wear you down. The head honcho himself uses three powerful Fire-types. Blastoise, Rhydon, Golem, or Vaporeon are excellent choices here. Watch out for Rapidash's Fire Spin; should it hit you with it you will be trapped and unable to fight back or switch, and if it's faster than you it'll continue to use it until you're down for the count. Ninetales can confuse you then hit you with Flamethrower to bring you down low, finishing you off with Quick Attack which always goes first. Arcanine is a bloody pain as it has three very strong moves and Reflect for support. The prize for this match is TM38 Fire Blast, which Blaine's Arcanine uses in the fight to inflict massive damage and the crippling Attack-reducer status burn. Ha! You better have Burn Heal!

Gym Leader Blaine NinetalesRapidash Arcanine
Battle Type
Single Battle
Items
Level 48Level 50Level 54
Attacks:
Confuse Ray
Quick Attack
Tail Whip
Flamethrower
Attacks:
Take Down
Stomp
Growl
Fire Spin
Attacks:
Reflect
Flamethrower
Take Down
Fire Blast
Gym #8 - Viridian City Gym

Location: Viridian City
Gym Leader: Giovanni
Specialty: Ground-type
Reward: Earth Badge, TM27

Puzzle:
The mysterious gym you passed by at the start of your adventure is now ready to be faced...and it's home to none other than your old nemesis Giovanni! The puzzle in this gym is another of those confusing arrow spinning mazes like in his Rocket Game Corner hideout. It's a real hassle but in the middle of the gym there's a Revive waiting for you should you need it. The trainers here are not Rocket Grunts but in fact Cooltrainers, Black Belts, and Jugglers: they also use a wide variety of Pokemon types including Normal, Poison, Fighting, and Rock. However, the main focus here is still Ground-types. Giovanni himself will try to bring you down in a plethora of ways; he'll mix brawn with brains, status with raw power, and whittling you down with direct one hit knockout. Persian will try to annoy you with Double Team. His Rhydon, a fearsome Pokemon on its own merit, uses a one hit knock out move, two power STAB boosted attacks, and the much less threatening Fury Attack. Dugtrio's Sand-Attack coupled with already ferocious Speed is extremely annoying, and Nidoqueen's extremely high powered moveset boasting Thunder and Earthquake can give you trouble for days if you don't pack Max Potions. Give this team a taste of Water-type moves: while Grass-type moves are handy for Rhydon, they are nulled by Nidoking and Nidoqueen, whereas a solid Surf or Hydro Pump can sweep his entire team just as well. The prize for this match is both entry to Pokemon League and TM27 Fissure, the nightmarish OHKO move used on you in this match. Save it for the Pokemon League!

Gym Leader Giovanni DugtrioPersianNidoqueenNidokingRhydon
Battle Type
Single Battle
Items
Level 50Level 53Level 53Level 55Level 55
Attacks:
Sand Attack
Dig
Fissure
Earthquake
Attacks:
Screech
Slash
Fury Swipes
Double Team
Attacks:
Tail Whip
Double Kick
Poison Sting
Thunder
Attacks:
Thunder
Leer
Earthquake
Thrash
Attacks:
Rock Slide
Fury Attack
Earthquake
Horn Drill
 
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