So Latios is always special, right? Nah. I've been running this set to surprising success, since everyone expects it to be a special set.
Latios @ Leftovers
EVs: 252 Speed, 252 Attack, 4 HP
This is great, as Latios forces plenty of switches and gets plenty of opportunities to set up a Dragon Dance. After a DD or two, Earthquake and Dragon Claw become powerful weapons that hammer away at everything not named Skarmory. Substitute lets you set up on Blissey switchins. Not really as effective as, say, Haxorus or Salamence, but it's still fun and gets plenty of surprise KOs. Plus it's faster than any other dragon other than other Lati@s, since her pitiful base 80 Attack pretty much forces you to run a Speed neutral nature.