garchomp @ leftovers
adamant (rough skin)
EV's: 252 attack, 252 speed, 6 HP
Attack:
- substitute
- dragon tail
- EQ
- fire blast/stone edge

Well, the tactic behind this moveset is to send it in against a pokemon which can't do much against garchomp. Therefore the opponent is forced to switch and you are able to substitute, making you able to either sweep the opponent or make it switch with dragon tail. Since there aren't alot of pokemon that are garchomp-counters you have a decent chance of making a new substitute again and doing some more damage.
Leftovers makes you able to substitute more so that's always handy
The last thing that I want to say, is that this moveset actually is only greater then the other movesets when you combine it with a nice entry hazard team.