im pretty sure that's Shedinja but you have to get him a speciall way i that i don't know :P
how you get him is get ninjask and hold at least one pokeball in your bag and only 5 Pokemon in your party. then evolve ninjask and you will get him.
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Spheal evolves at level 32 into Sealeo. Sealeo evolves into Walrein at level 44. http://serebii.net/pokedex-dp/363.shtml
Route 44.
go to route 44
Level 44.
level 42 or 44