Celebi is a pretty good OU counter. As shown in the analysis, even if it switches in a Bulk Up, Shadow Punch won't 2HKO, and it can 2HKO back with Psychic.
Edit: Oh, and Choice Band Staraptor can OHKO with Brave Bird even after one Bulk Up (I'm pretty sure, but I haven't made the calcs to confirm it, though). And since it's always faster and it isn'affected by Shadow Sneak, it's a good counter.
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Last edited by Time Mage; Apr 13th, 2008 at 8:14:57 AM.