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Hi OP, these are the two viable charizard X sets:
Charizard-Mega-X @ Charizardite X
Ability: Tough Claws
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Dragon Dance
- Flare Blitz
- Dragon Claw
- Roost
Standard sweeper set. Earthquake is an option over roost, but it means if somebody happens like you get whirlwinded into this on rocks, you're fucked, and it generally hurts the longevity it has.
Charizard-Mega-X @ Charizardite X
Ability: Blaze
EVs: 248 HP / 24 Def / 124 SpD / 112 Spe
Impish Nature
- Flare Blitz
- Earthquake
- Will-O-Wisp
- Roost
And this is the bulky wisp set. Speed evs beat standard tank chomp to wisp it first, and Jolly base 70s. Sp def lets it narrowly live 2 focus blasts from timid char y, rest was dumped into def with a positive nature. I guess if you want then you can run a lot more speed to beat timid heatran and KO it with earthquake. The general idea is that you spread burns around to let you tank physical hits and wear down the opponent, and can still take on special threats like Thundurus. This set beats things like Azumarill and defensive lando t 1v1, so it can be very surprising.
