It evolves when it learns Ancient Power.
Swinub evolves into Piloswine at level 33 and it can relearn Ancient Power with the Move Maniac in Pastoria City (make sure you have a Heart Scale). Level it up by 1 level and it will evolve in to Mamoswine.
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It cant evolve in Pokemon silver, but it can it diamond/pearl. You just level it up when it knows ancient power. Then it evolves into Mamoswine.
It can evolve as early as Level 33 in Pokemon Diamond, Pearl, Platinum, HeartGold and SoulSilver but it needs to know the move AncientPower.
Yanma can sometimes be found on Pokemon Diamond, Pearl, and Platinum in the Great Marsh in Pastoria City. You could also catch and evolve a yanma from HeartGold or SoulSilver (found on Route 35 during a swarm) and trade it over to your Pokemon Diamond version. Yanma evolves once it learns AncientPower. You can obtain yanma on Firered or Leafgreen version in Ruin valley and migrate it over to your Pokemon Diamond, Pearl, or Platinum version have it learn AncientPower...and there you have it, you're very own yanmega.
You can't because mamoswine was made in the 4th generation games diamond and pearl and platinum it never existed in leafgreen.
Likitung will evolve into Likiliky after it learns the move AncientPower. In Pokemon Diamond, Pearl, and Platinum, that is at level 33. It may be different for Soul Silver and Heart Gold.