Piloswine doesn't evolve into Mamoswine by level. It will evolve into Mamoswine by leveling up while it knows the move AncientPower. Swinub can be bred to have this move, or you can go to the Battle Frontier (after the Johto Elite 4) and use the move tutor there to teach it to your Swinub or Piloswine.
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Level it up with Ancient Power learnedYou can evolve your Piloswine into Mamoswine by using the Move Tutor in Blackthorn City. Be sure to teach your Piloswine AncientPower. Then, level it up 1 level and it will evolveSwinub evolves at 33, Poliswine evolves by teaching it Ancient PowerHope this helps :)
Piloswine can no longer evolve at level 100 as it must level up with the move Ancient power to become Mamoswine.
teach Piloswine AncientPower and level it up
Piloswine doesn't evolve in Colloseum. Migrate to D/P/Pt
you cant