Won, Ojama still isn't used to put Frustration in lieu of Return I guess
EDIT: You're exaggerating it, you were only at +2 when you used Return, moreover:
788 Atk vs 284 Def & 534 HP (102 Base Power): 263 - 310 (49.25% - 58.05%)
Factoring in Leftovers, Wish, and Protect, I still had a good shot at killing you with Toxic. You didn't "have" it.