>>15591448>which would've just worked in the first place without having to Mega Evolve himDespite the whole ironic anger thing, that wouldn't have worked at all, no, considering how at some point or another, you'd run into something Charizard couldn't deal with and have to run away from. So he'd probably have to switch out any time your opponent sends out, basically, any water or fire Pokemon who resists flying. Such as any of the water/rocks. Or maybe something with Aqua Jet.
As a dragon/fire type, that type of problem sort of doesn't exist. Fire/Dragon is near-unresisted STAB (bar Azumarill). With a single move for coverage to deal with Azumarill, who can't deal with a set up Charizard X due to Dragon resisting Water to counteract the Fire being weak, Charizard isn't nearly as good as Mega Charizard X.