Like in previous games, you can make legendary pokemon your companions too, but naturally, it will be harder than the average wild pokemon, though the conditions still base on the following factors:

1) Your leading pokemon's level
2) The Friend Ribbon
3) Who beats the wild pokemon
4) Luck

 

Pic: Name: Size: Level: Location: Requirements:
Articuno 2 43 Mt. Avalanche Summit Nintendo Wondermail Event Only
Zapdos 2 29 Electric Plateau 7F Must have Secret Stoneplate or Enigma Part in bag
Moltres 2 45 Final Maze B40F  
Mewtwo 1 50 Dark Crater B6F
Watchman Cave Deepest Part B5F
Must have Secret Stoneplate or Enigma Part in bag
Dark Version Only
Mew 1 46 Mysterious Jungle Interior Nintendo Wondermail Event Only
Raikou 1 46 Hidden Ruins B20F Must have Secret Stoneplate or Enigma Part in bag
Entei 1 47 Dark Crater Deepest Part B10F Must have Secret Stoneplate or Enigma Part in bag
Suicune 1 45 Final Maze B29F None
Lugia 4 45 Enclosed Sea B18F Must have Secret Stoneplate or Enigma Part in bag
Ho-oh 4 43 Mt. Wind 19F Must have Secret Stoneplate or Enigma Part in bag
Celebi 1 ? Mystic Forest 10F Must have Secret Stoneplate or Enigma Part in bag
Time Version Only
Regirock 2 46 Watchman Cave Regirock's Chamber On Second Visit
Regice 2 46 Watchman Cave Regice's Chamber On Second Visit
Registeel 2 46 Watchman Cave Registeel's Chamber On Second Visit
Latias 2 44 Sky Fissure 10F
Joy Cape B10F
Must have Secret Stoneplate or Enigma Part in bag
Latios 2 44 Sky Fissure Deepest Part B5F
Dark Night Forest B24F
Must have Secret Stoneplate or Enigma Part in bag
Kyogre 4 49 Bottomless Sea Bottom Nintendo Wondermail Event Only
Groudon 4 49 Shimmering Desert Interior Nintendo Wondermail Event Only
Rayquaza 4 49 Sky Stairs Summit Nintendo Wondermail Event Only
Jirachi 1 45 Final Maze B23F  
Deoxys 1 45 Shining Hill 17F Must have Secret Stoneplate or Enigma Part in bag
Uxie 1 42 Hot Water Cave Summit After Credits Roll
Mesprit 1 42 Quicksand Cave Underground Lake After Credits Roll
Azelf 1 42 Great Crystal Passage Crystal Lake After Credits Roll
Dialga 4 48 Dimensional Tower Summit After Credits Roll
Palkia 4 48 Sky Fissure Bottom On Second Visit
Heatran 1 49 Giant Volcano Summit Nintendo Wondermail Event Only
Regigigas 4 49 Watchman Cave Regigigas's Chamber On Second Visit
Giratina 4 48 The Great Hole 30F Nintendo Wondermail Event Only
Cresselia 1 47 Sharpedo Rock Automatically recruits after Darkrai mission
Phione 1 40 Miracle Sea Bottom Automatically recruits on second visit
Manaphy 1 40 Sharpedo Rock Automatically recruits when it returns after the Darkrai mission
Darkrai 1 53 Mystic Forest 13F
Crevice Cave Deepest Part B2F
Miracle Sea B3F
Mt. Practice B17F
Sky Fissure B14F
Must have Secret Stoneplate or Enigma Part in bag

 
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