Wedge Antilles was actually the first to nominate Ditto. I was thinking that a Lv100 Eccentric Ditto holding a Choice Scarf might be fun. 50% faster but can only use a single move. It wouldn't do very well against opponents that rely on special equipment but I think it could lead to fun matches against opponents that don't.
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Pokemon VGC2011 NW Regional - Top 8
Pokemon VGC2011 US Nationals - 54th place