I would personally get rid of Psychic. Psystrike gives Mewtwo that valuable ability to hit the opponent's defense physically as well as specially.
Go with CB, and V-Create, Fusion Bolt, U-turn and something else idk (probably Zen Headbutt, though I ran Grass Knot to hit Swampert and Rhyp in BW UU).
To expand, Adamant is an ideal nature for Victini to have, given the physical nature of V-Create. To condense what Moxieinfinite said, here's Choice Band Victini with an EV spread:
Is it offensive or defensive? If it is defensive, use shell armor, and if it is offensive, use swarm.
It has Evs in Hp and Attack. So it could really go either. It is holding an occa berry so it can survive one fire attack.
IMO, either ability doesn't matter on Escavalier. It all depends on what you need. On one hand, Swarm can make Megahorn hit like a nuke when Escavalier is in a pinch. On the other, Shell Armor prevents an untimely critical hit from potentially taking out Escavalier.
Typically, for a Greninja you want to max out its Speed and Special Attack with both EVs and IVs. Get a Timid nature one with its hidden ability Protean.
Heracross can learn Arm Thrust and Bullet Seed at level 1, or by giving Heart Scales to the Move Relearner in Dendemille Town. It also learns Pin Missile at level 31. But if you want Rock Blast, you should breed a female Heracross with a male Shuckle that knows Rock Blast.
Arm Thrust isn't worth using over Close Combat because of these reasons:
