Mixed Set
Escavalier
Quiet Nature
Ev's:252 Atk 252 Sp.Atk 4 Hp
Bug Buzz
Iron Head
Hidden Power(Water)
Pursuit/Focus Blast
I am jesusfreak94, and I approve this message.
I, too, applaud the use of Hidden Power to cover Escav's one Weakness. I don't like the fact Escav' only has Base 60 Sp.Atk, but it could be a lot worse. That said, Ground or Rock could be alternative Hidden Power Types, but they wouldn't get a boost from Rain, which that particular set might also rely heavily upon.
A Level 100, Base 70 Power, non-STAB Hidden Power (Water) with Rain and Base 60 Sp.Atk at maximum (a Sp.Atk stat of 240 with an IV of 31, 252 EVs, and a +Sp.Atk Nature), has the following results (VS Level 100, no other stat buffs or debuffs):
-Condition, Effectiveness (example Pokemon, Base Sp.Def): Damage output
-Maximum Sp.Def, 2x Effective subject (Ho-oh, Base 154): 80-96
-Minimum Sp.Def, 2x Effective subject (Ho-oh): 130-154
-Ho-oh's HP ranges from 322-416
-Maximum Sp.Def, 2x Effective subject (Darmanitan, Base 55): 158-186
-Minimum Sp.Def, 2x Effective subject (Darmanitan): 350-414
-Darmanitan's HP ranges from 320-414
-Maximum Sp.Def, 4x Effective subject (Magcargo, Base 80): 252-300
-Minimum Sp.Def, 4x Effective subject (Magcargo): 488-576
-Magcargo's HP ranges from 210-314
-Maximum Sp.Def, 4x Effective subject (Solid Rock Camerupt, Base 75): 198-234
-Minimum Sp.Def, 4x Effective subject (Solid Rock Camerupt): 390-459
-Camerupt's HP ranges from 250-344
-Maximum Sp.Def, 4x Effective subject (non-Solid Rock Rhyperior, Base 55): 316-372
-Minimum Sp.Def, 4x Effective subject (non-Solid Rock Rhyperior): 700-828
-Maximum Sp.Def, 4x Effective subject (Solid Rock Rhyperior): 237-279
-Minimum Sp.Def, 4x Effective subject (Solid Rock Rhyperior): 525-621
-Rhyperior's HP ranges from 340-434
These examples show that damage from Hidden Power (Water) with Rain is quite respectable, even though it's kind of weak normally. Barring a Drought-tales, Hippow-Stream, or Sand-ranitar's intervention, you can 1-to-3 K.O. many Fire Types and/or Rock Types. As to Bug Buzz, I'd advise against with that set...