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Holy crud, just read the edit. So essentially when using a water move this thing effectively has 140 base attack, 100 base Sp. Attack, plus double whatever investment you put into it.
Oh.
Choice scarf that thing up and it's not incredibly slow. Maybe there's hope for the bug yet. You could...
Singles set this thing probably isn't anywhere close to being OU, but I'm sure whatever tier it ends up in it's going to be beloved as a landmine/wall. Personally, I appreciate that it's at least versatile. You could run a counter/pain split set to force out non-substitute sweeper. You can also...