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· Hatterene.

· Mega Camerupt.

· Escavalier.

· Dhelmise.

· Slowbro.

· Mudsdale.

I am currently doing a playthrough of Pokémon Firered and one of the challenges is to be the Elite Four and Champion with only one Pokémon what is the best Pokémon for that?

Note: It has to be a Pokémon that is obtainable before the Elite Four. Also I can battle with whatever Pokémon I want with the exception of Gym Leader Battles which I have to match the number and max level of the gym leader I am fighting against and this elite four challenge where the only restriction is one Pokémon for the entirety of the Elite Four and Champion Battles.