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To be fair, Dazzling Gleam provides a secondary STAB, and Ancient Power does worse against the Charizards because it can't flinch, which is bad when you're locked in.
And ashiemore, this is why:
Mawile used Iron Head!
NOT HAX avoided the attack!
Username: PokeGyarados
Tiers Played: XY UU, BW UU
Foreseeable Activity: Probably will have trouble playing anytime before 5PM (GMT+10), but otherwise should be ok.
Lol, random nitpick but technically the Pokemon's Speed stat actually DOES change when it Mega Evolves - the only reason that it appears not to be the case is because turn order is decided before anything happens (only time it can change mid-turn is through the use of the move After You). Of...