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Physically defensive tropius.
I've won against garchomps and m-mawiles with this annoying set.
Tropius (harvest) @ kee berry
Impish, max def max hp
>roost
>leaf blade
>earthquake
>leech seed
Tank a physical hit, eat kee for the free def boost and roost up while you boost up. I haven't tried the specially defensive version of this but I don't think it'll work as well with ice beam being very common.