To evolve Pilowswine into Mamoswine your Pilowswine will need to learn the move Ancientpower. Then, it will evolve.
it evolves if you trade it with asoft sand
Catch a swinub when they swarm on route 217 and evolve it
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Piloswine doesn't evolve by level; instead, it evolves when it levels up knowing Ancientpower.
you dont actually find one you have to find a swinub or pilowswine and evolve it
Teach Poliswine Ancient Power and it will evolve
Go to a Move Master and get him to teach it ancient power. Then level it up one level. Signed, N1TR01D
Weavile does not evolve in Pokemon Black.
All the starters evolve in Pokemon Black. Many other Pokemon evolve as well.
level it up while it knows ancient power
Piloswine doesn't evolve at a particular level. Piloswine evolves into Mamoswine when it learns Ancient Power (via Move Tutor in Pastoria City) and levels up.
To get a Mammoswine in Pokemon Diamond/Pearl, you must teach your Pilowswine Ancient Power. Pilowswine can't learn Ancient Power, so you have to mate it with a male Pokemon that has the move Ancient Power. Wait awile then receive the egg from the old man and the baby Swinub has the move Ancient Power like the father.