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the same can be said for any gimmick set, however with team preview and just the sheer amount of counters that set has, pretty much every single team ever will be prepared for it.
I personally think that Chandelure should be an A-rank pokemon.
-It has ONE HUNDRED AND FOURTY FIVE base special attack.
-With a bit of prior damage, choice scarf Chandelure can easily get 3-4 pokemon sweeps.
-It has immunities to fire, normal and fighting.
-It has an incredibly good movepool...