RE: The Competitive Battling Questions Thread
first off, just make sure that your Pokemon have 0 EVs to start with. Based on the levels you gave, I'm going to guess you battled with them quite a bit, so they probably have EVs spread around all its stats.
You can do one of two things:
1) Get new species of each Pokemon, freshly hatched/caught, having earned no battle exp.
2) Use EV-erasing berries en masse to erase all existing EVs on your Pokemon. This is usually more tedious, and the berries are found only through Dream World.
Once you have no EVs you can start EV training. Here are some of my opinions:
Metagross: Primarily physical, so you will probably want to dump a lot into Attack and Speed. Agility is also a good move to have on it, as after one it will outspeed a lot of things.
Dragonite: Dragonite can do a lot of things, and its primary strength is its bulk; Multiscale (DW ability) just adds to this. There are a few things you can do with this.
Zekrom: Like Metagross it is primarily physical, so focus on Attack and Speed.
Victini: Victini's capable of being mixed, but his forte is physical too, given that he gets V-Create and Fusion Bolt via event. Attack and Speed are good areas to focus on, although mixed and special sets exist too.
Emboar: I dunno, mixed/physical?
Kyurem: Like Victini, Kyurem's capable of doing a lot, and does equally well on both the physical and special fronts. Check Smogon for set ideas on all the above so you can get started.