Piloswine can no longer evolve at level 100 as it must level up with the move Ancient power to become Mamoswine.
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teach Piloswine AncientPower and level it up
Piloswine doesn't evolve in Colloseum. Migrate to D/P/Pt
In Pokémon Platinum, Swinub evolves into Piloswine at Level 33.
Swinub evolves into Piloswine at level 33. After that Piloswine can evolve into Mamoswine if it levels up while knowing the move AncientPower.