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Bulk or Speed, all he needs.
Make him base 100 speed, and he'd be a decent sweeper by shear coverage.
Add some health and Defense, and he'dbe an acceptable AV user.
For fun, though, Mega-Gallade:
Ability: Bladesman (slash/cut/slice version of Mega Launcher)
Hp:68
Att:125 -> 145
Def:65 -> 90
SpA:65 -> 75
SpD:115 -> 135
Spe:80 -> 105