"Charizard X Will Rip Your Face Off With A Well Aimed Fart"
Ability: Tough Claws (Only Ability, but increases the power of Physical attacks)
Nature: Brave (+Attack, -Speed)
Item: Obviously, the Charizardite X
EV's: 252 Attack, 252 Sp. Defense, 6 Speed
Flare Blitz/Fire Punch/Flame Charge- Flare Blitz has 120 Damage, STAB, increase from Tough Claws, and has a boost from Charizard X's huge Attack and Attack EV's. However, after doing a lot of damage, it takes a third of the immense damage it dealt, which, when OHKOing a Pokemon, will take serious health off the bar. It also has a chance to burn, and with 100 accuracy, to some it might be worth the risk. Then, there is Fire Punch. Less damage, same PP, same accuracy, and same chance to burn. However, all of Charizard X's boosts make it still do a lot of damage, and without the risk of recoil. And finally, there is Flame Charge. Still less damage, same accuracy, and doesn't have a chance to burn. However, I'll say it again, boosts from Charizard X make it do a lot of damage, and increases Speed every time. Holy crap, that took a minute.
Outrage/Dragon Claw- Outrage does 120 Damage, had 100 Accuracy, and hits multiple times. However, it then confuses Charizard X, so if it hits itself in confusion, it will do a pretty good amount of damage, for the hit from confusion is Physical (I don't know if hits from confusion actually are affected by Tough Claws, but I know that having high Attack does.) Now, for Dragon Claw. Less damage, same accuracy, and more PP. Nothin' else to it, besides not causing confusion. Both deal with Dragon types, one of it's weaknesses.
Solarbeam/Earthquake- Charizard X is weak to Rock and Ground types as well as the Dragon type, so Solarbeam works well. Charizard X already has powerful Sp. Attack, so paired with Sunny Day, this could potentially eliminate most of Charizard X's weaknesses. Then there's Earthquake. Paired with Swords Dance, this move can be devastating. This provides coverage against types that resist Fire and Dragon types, or those who are weak to Ground.
Swords Dance/Sunny Day- Along with Charizard X's Ability, his high Attack/Attack EV's, most of his moves STAB, and his Attack friendly nature, now increasing his Attack by 2 Stages sounds OP... I like it! However, if you want Solarbeam to hit immediately, I would recommend Sunny Day. As well as making Solarbeam hit without charging, it also increases the power of Fire type moves used in battle until it fades.