Well, the analysis revamp in QC has Modest for more power, and cause it just barely outspeeds Greninja with its fabulous scarf. That's most of the more relevant OU metagame, so more speed is only really for revenging boosted things. With how rare Dragon Dance EQ Charizard is now, I like the ability to more reliably damage CM Clef, and do more with my respective Rock move on SpD Talon and Char Y.
Huh, didn't know that. Low Kick Weavile would still rek you, but that's probly not common in Wi-Fi. I guess if you're really worried about Mega Dactly/Zam/Man you could run Timid, but yeah Modest is probly better then. And Stone Edge is a viable option too, it does more than HP Rock/Ancientpower even with a -Atk nature against Tflame and Yzard