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Anyways, the idea is that you do the regular stuff, just play the game, but whenever a Rillaboom or a Tangrowth comes in you switch in Bouffalant (Unless you know for sure they aren't going to use a grass type move), Sap Sipper activates and you could potentially sweep.

Of course it isn't guarenteed, since Bouffalant isn't like strong, a base 110 stat isn't bad, but it's just not great. This does give you a nice grass immunity though, and if you predict right you might be able to kill a couple mons with him.

Bouffalant has been given a choice scarf so his shitty speed doesn't completely ruin any potential of doing something.
He is supported by amazing agent Seismitoad, the grass type bait. Also a special wall, can beat most Hydreigon's 1 on 1.