yes,piloswine can evolve when it learn an ancient power.
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Mamoswine doesn't evolve either way because it doesn't exist in Pokemon LeafGreen. It evolves from Piloswine who evolves from Swinub, but Piloswine can't evolve into Mamoswine in LeafGreen.
You can't because mamoswine was made in the 4th generation games diamond and pearl and platinum it never existed in leafgreen.
Piloswine doesn't evolve in Colloseum. Migrate to D/P/Pt
L.36
teach Piloswine AncientPower and level it up