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legacy gengar
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Unless you just want a Legacy Gengar for collecting, Sludge Bomb's usually better.
Because Gengar is pretty much required to dodge every attack, Sludge Bomb's faster cooldown before your next action means there's more moves where you are able to use your charge move and still be able to dodge the next attack compared to Sludge Wave, and also Sludge Bomb does more DPS per cycle if you're just spamming attacks without dodging.