>>20719031Adamant/Dragon Dance is probably your best bet, as Jolly doesn't do enough on base 100 Speed to outrun much. Meanwhile Adamant is perfectly fast enough with the +1 Speed from a Dragon Dance, outspeeding anything that's max invested in Speed up to 153 base (which is everything but Ninjask and Deoxys-S) as long as they're not boosted.
Drum/Roost doesn't work very well due to sneaky pebbles knocking regular Charizard down to 50% whenever it comes out. XY is a priority-based metagame and if you do manage to get the Belly Drum off with 1% HP left due to rounding, you're just gonna get revenge-killed with Aqua Jet or something, assuming they didn't already kill you on the drum turn. To get a chance you need to Roost off the damage right away, which gives your opponent a chance to switch in something better and easily take off the rest of your HP after the drum.
WoW/Roost seems risky to me, I guess in theory it could work if you're up against a team of physical attackers, but currently there's Fire-types and Flash Fire Heatran running around everywhere, and you're still looking down the wrong end of a Draco Meteor.