So, on a DD Charizard X set, the attacking options are usually Flare Blitz, Outrage, and Earthquake. I've been using this moveset pretty much on every ZardX I ran on my teams, but how bad will it be if Earthquake was replaced with Roost? Yes, you lose to Heatran, but CharX has to Outrage vs. Balloon tran anyway. Brick Break is an option since it can also hit Ttar but EQ has more raw power and hits other things for good neutral damage.
I'm not happy with the fact that CharX often kills itself due to the insane power of Flare Blitz, so I've been thinking about foregoing EQ for Roost. But how much will this affect it exactly, and can CharX afford a turn to Roost up?
Referring to the Smog's Mega Stones in OU article. Because Fire/Dragon is such a beastly STAB combo Zard X can afford to run Roost over EQ, though it does make it more susceptible to Tran and Azumarill and forces you to play Mind Games with Aegislash's King's Shield, but other then that no real loss comes from slashing EQ, but given how common those three threats can be, it's your choice on Coverage vs Survivability, because Zard X has 111 Def and 85 Sp. Def not bad for something as threatening as Zard X, so Roost isn't completely out of the question, just if you run it instead of EQ, be sure to pack a answer to the three Pokemon mentioned earlier.