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Thank you for the comparison! The reason I run flare boost is so I'm not locked into a slot, and I usually also run support Scream Tail with Wish and Regenerator to keep Greninja and whatever else is on the team at least somewhat healthy, usually MGLO Volcarona and BoR Hydreigon.
This is a...
Flare Boost Greninja is fun to use, it outspeeds and cripples Iron Leaves and Roaring Moon, limits Corv's potential (but does not cripple it) and is highly rewarding with the right predictions, such as predicting a Dnite switch in and either ohkoing it with Ice Beam or weakening it with a Flame...