I use Ditto as a lead. Imposter reveals all four of the opponent's moves, and then I can switch according to those moves. If they have moves like Taunt, Stealth Rock, Toxic etc., I switch to Magic Bounce Espeon to reflect them right back. I call this combo "EspyDit".
I peaked at rank 19 in Dream World OU on our PO server using nothing but gimmicks. js
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