Clawitzer @ Expert Belt / Life Orb
Trait: Mega Launcher
EVS: 252 HP / 4 Def / 252 SAtk
- Water Pulse
- Ice Beam
- Sludge Bomb/Dark Pulse
- Aura Sphere
Alright so Clawitzer's pitiful base 59 speed means that it would still only hit a maximum speed of 238, so there really isn't much of a point investing in that. Clawitzer on the other hand has decent 71/88/89 bulk, with an impressive base 120 special attack - so the EVs focus on maximising bulk in the form of HP and Special Attack to maximise damage.
Water Pulse is the STAB move of choice, being boosted by Mega Launcher from 60 power to 90 power the exact same as sruf - except iwht a 20% confusion chance. Ice Beam is the move of coverage to nail Dragon Types, Grass Types etc. while Aura Sphere is to hit steel types and such, as well as getting the boost from Mega Launcher. A choice between Sludge Bomb and Dark Pulse can be made, with Sludge Bomb hitting fairy types for good damage, while Dark Pulse gets the Mega Launcher boost and is Clawitzer's best choice aginst ghost types like Aegislash and Mega-Gengar.
In regards to the item, factoring in Clawitzer's pretty good coverage, Expert Belt could be a choice, while Life Orb is an option to increase the power of all Clawitzer's moves. Alternatively Leftovers could be used to make Clawitzer a more bulky attacker with some form of healing.