Can't be injured by flying types? Wait........what? It's weak to flying! Aerodactyl still outspeeds it and KOs it most likely, although 100/75/75 defenses surpass Starmie's 65/85/85. However, 4x weak to Ice is a problem. Ice Shard from Weavile can quickly lay on the KO with CB, although Skymin has that Quick Attack to get the jump on weakened Weavile.
The more offensive Giratina...I really don't think it's going to be too useful without a Scarf. It's too slow, but Ghost + Dragon in Ubers = wonder offensive typing. Shadow Ball + Dragon Pulse or Shadow Claw + Dragon Claw destroy most Ubers, even the likes of Shedinja. Its defenses are still adequate enough to tank, but not wall.
The new Rotom forms, I don't know. I'll wait for more information.
Two things that make me facepalm: Neither Flareon or Entei got Flare Blitz. They got Lava Plume and Eruption, respectively. Seriously, one of them needed a good Fire STAB, but Game Freak didn't grant this...I wanna gun them down now. Also, with the expected Outrage tutor, Dragonite is 95% outclassed by Salamence or heck, even Kingdra! (Dragonite still has a more varied special movepool and Focus Punch, although that special movepool isn't useful.) Dragonite better get a saving grace of some sort this coming generation or else it's going straight to BL and remaining there for eternity.