Mamoswine ( either A- or B+ rank )
Ability : Thick Fat
Good movepool with Ice Shard/Earthquake/Blizzard/Ancient Power. You may want to delay Swinub evolving to Piloswine until lvl 37 to get Earthquake earlier, and you'll need to tutor him Ancient Power to evolve to Mamoswine. But once he's completed, he's quite a threat. Priority Ice Shard kills or put a serious dent to everything that doesn't resist it, and will be very useful for future Dragon gym. Earthquake is Earthquake. Ancient Power to handle Flying/Fire type (Talonflame and Charizard) and for semi setting up. Blizzard to break some Field Effects ( and to surprise physical wall ). But he's not a very fast pokemon, and you're not gonna get a Swinub that early (Akuwa Cave). He's my favorite pokemon since Platinum ( 1 shotted Cynthia's Garchomp ), and i'd love to see him somewhere in the ranking.