Have Piloswine learn AncientPower and level it up.
(Piloswine cannot learn AncientPower through level up. Go to the Move Maniac in Blackthorn City and have a Heart Scale. Talk to him and teach your Piloswine AncientPower.)
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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
In Pokémon Platinum, Swinub evolves into Piloswine at Level 33.