The Bliazzard (poor spelling on serebii's behalf, the actual classification, or possibly a mistake by GameFreak.) While it looks weird with that random ting sticking out of it, and the first form in the line looks like Castform, this guy is decent, and I had at one time considered him for my team.
Ability: Ice Body
EVs: Sp Attack, Sp Def, Def Nature: Calm
Hail: WIth healingdue to Ice Body, increasing the power of Blizzard by x1.5 and making it have 100% accuracy and more, plus increasing Sp Def by x1.5, this move has really gotten an upgrade this Gen.
Blizzard: Power increased by Hail, accuracy 100% in hail, and has a 25% chance of breaking through Protect and Detect in Hail. All this adds up to a damn powerful move, especially taking into acount the pretty nice Sp Attack stat.
Body Purge: Not only doubles Speed, but also makes this guy lighter. This provides better protection from Low Kick and Grass Knot. While you will take more damage from Heavy Bomber and Heat STamp, those moves are much less common than Low Kick and Grass Knot (especially Grass Knot.) However, the main point is the Speed boost.
Water Pulse/Flash Cannon: This is a tough choice. Water Pulse deals with Fire and Rock weakness, but has 20 less base power. Flash Cannon has 20 more base power, but only deals with Rock weakness. A very difficult choice.