you stab it until it evolves. actually you teach ancient from the move tutor, then level it up one level and it will evolve
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Just teach it AncientPower, then level up
Swinub evolves into Piloswine at level 33. After that Piloswine can evolve into Mamoswine if it levels up while knowing the move AncientPower.
level it up by one level after it has learned ancientpower
You can't catch Mamoswine in that form in SoulSilver, but you can catch a Swinub on the Ice Path in SoulSilver, and evolve it to Piloswine at level 33, and then level it up after it knows the move Ancient Power.
yes,piloswine can evolve when it learn an ancient power.