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I'm using a Modest bulky-offensive set with 120 HP / 136 SAtk / 252 Spe. The 136 SAtk is for OHKO'ing Chompy with SR down with Razzle-Dazzle Eye-Rape Beam. It works excellently with Galvantula supplying the Silly Strings.
By the way, if you're running three attacks, don't use Aura Sphere. Use Fire Blast, or even better, Shadow Ball just to spite Mega Bullshit.