Me personally, I try to get through the story as quick as possible.
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Doesn't seem like there is much potential this Gen for OU Pokemon aside from Greninja, Aegislash, Goodra, and Zygarde.
Still, seeing as there is only 69 Pokémon that isn't too bad. Dragalge bight BL and I see Tyrantrum either in upper RU or maybe UU. However, a lot of old Pokémon will most likely be moved up a tier, Azumarill is almost guaranteed a place in OU and Gardevoir might get a spot as well. I think this Gen's metagame is a bit slower and much more defensive so other defensive threats might make an appearance.
Ok, so the three event legendaries were hacked into the game, as well as Fairy Arceus and Mega Latios/as. However, with hackers trading hacked pokemon over Wonder Trade, this causes problems.
Hacked Pokemon traded via Wonder Trade create multiplying bad eggs which end up filling the PC Boxes, covering up your Pokemon, and destroying your save. I've heard they also don't disappear when you restart the game. It's likely Nintendo will be able to patch this. Until then, however...
Trade at your own risk.
I'm upset, though. I liked wonder trading. GTS should be safe as long as it's a safari or in-game pokemon.
Volcanion's awesome. Diancie will have something to do with the Sundial. Hoopa's sweet.