Dragalage @ Choice Specs/ Expert Belt
EVs: 252 HP, 252 Sp. Atk, 4 Sp. Def
Nature: Modest/ Quiet
- Sludge Wave
- Surf/ Hydro Pump
- Draco Meteor
A bit strange that it can't learn Ice Beam when it can learn Hail? In any case, another slow Dragon type from Gen VI. Dragalge, unlike Goodra, would work really well with Trick Room in both singles/ doubles; base 44 speed is only faster than things like Reuniclus, Escavalier and Ferrothorn. Having said that, I don't think Dragalge will be OU; even though it has Poison typing and nice sp. def, it's the slowest of all Dragons, meaning it faces a lot of threats - Flygon, Hydreigon, Noivern et al.
Hydro Pump is an option for doubles when Surf will hit your adjacent Pokemon as well. Thunderbolt is for some good coverage, Sludge Bomb for STAB; even with base 97 sp. atk, Adaptability will be devastating. Finally Draco Meteor for Dragon coverage. Quiet nature is if you want to abuse Trick Room, otherwise go for Modest. Expert Belt can be used to give the appearance of being Choiced, since it has a great ability that'll boost its Sludge Wave & Draco Meteor.