Originally Posted by Fat Lucien Lachance
Dark Gem Crunch does a lot of damage to Cresselia, possibly can KO. Choice Scarf if you want to run Jolly and 252 Speed is probably the best item for Tyranitar since it gets the jump on threatening Pokemon like the Genies and Latios and can KO Latios with Crunch and 2HKOs the genies with Rock Slide. Of course you would swap Protect with an elemental punch or something.
hm... Very interesting. I like the idea of Scarf better, but I'm worried about setting up weather when Abombasnow, Ninetales, and Politoed come out same turn.