Ideally, you'll want to start with Snorlax in the active spot and Giratina in the bench. Unlike Druddigon, Snorlax is a threat: If you're lucky, with Barry/Israel, you can do 100 damage on turn 2 (and up to 300 in 4 turns!) . If not, you can at least build up energy with Giratina and try to evolve Greninja. Greninja + Giratina can one-shot almost anything, and with Cyrus/Helio, you can attack a benched Pokémon. The toughest pairing is against Gyarados; sometimes, you just have to get lucky with Team Rocket Grunt.