Piloswine is absolutely INSANE
So I caught a wild high IV Swinub and evolved it into a 1592 CP Piloswine. Turned out it got Powder Snow/Avalanche, so I tested it.
First up was a 3102 CP Dragonite. I was shocked. Piloswine destroyed the Dnite without dodging anything. In less than 15 seconds.
Powder Snow generates so much energy that you can constantly spam Avalanche, a 90 power 2-bar move. The damage output is insane. When adding this to Piloswines good bulk, you've got a monster. This is easily the best Dnite prestiger in the game.
I haven't powered one up to full yet, but my 1592 CP Pilo outperforms my 2050 CP Cloyster by a large margin. Most likely it is also the best ice-type attacker in the game.
I also used it against a 3k Snorlax, and it won again. But this time I had to dodge. I think Piloswine can be a really good generalist prestiger as well, but as mentioned, against Dnite it is the king.