some people like to raise evaisiveness and lower accuracy. be prepared is what i was implying. also, v-create is extremly powerful, so if you prioritize, it makes it great for trolling and sweeping.
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plus, what if stealth rock or spikes is in play, you still want to do damage, but half of your hp is gone. if you waste your turn on roost or synthesis, you'll most likely get knocked out. the best solution is what is big root oblivion wing. besides, if you get lucky like i did, your smeargle will most likely outspeed most of the current pokemon.