That looks like a solid set-up sweeper, but how about this:
Bibarel (Omanyte) @ White Herb
Ability: Simple
EVs: 252 HP / 252 Spa / 4 Speed
Modest Nature
- Shell Smash
- Surf
- Ice Beam
- Earth Power / Ancient Power / Thunderbolt
Going from 35 / 40 / 100 / 90 / 55 / 35 -> 55 / 80 / 120 / 110 / 75 / 75 isn't quite as eye-popping as some stuff already mentioned, but getting to +4/+4/+4 in one turn is insane. You also gain access to great coverage moves from Bibarel, such as Thunderbolt, Grass Knot, Superpower, and other things like Taunt and more priority in Quick Attack. You could also go physical with Rock Slide / Waterfall / Shell Smash / Coverage, but it is powerful wincon either way.
Bibarel (Omanyte) @ White Herb
Ability: Simple
EVs: 252 HP / 252 Spa / 4 Speed
Modest Nature
- Shell Smash
- Surf
- Ice Beam
- Earth Power / Ancient Power / Thunderbolt
Going from 35 / 40 / 100 / 90 / 55 / 35 -> 55 / 80 / 120 / 110 / 75 / 75 isn't quite as eye-popping as some stuff already mentioned, but getting to +4/+4/+4 in one turn is insane. You also gain access to great coverage moves from Bibarel, such as Thunderbolt, Grass Knot, Superpower, and other things like Taunt and more priority in Quick Attack. You could also go physical with Rock Slide / Waterfall / Shell Smash / Coverage, but it is powerful wincon either way.