Ok then! I'm already finding out some very interesting things. Spoilering below in case you want to find out about it yourself. It happens pretty early in the game though.
First off, after you get your Pokeballs from May and start going out to catch your own Pokemon, go a little farther up into Route 101 and May will introduce you to "sneaking" up to Pokemon that are shaking the grass nearby. Apparently, these Pokemon have moves that they normally wouldn't have if you had caught them normally.
I've caught 2 so far using this method. The first (the intro) was a Poochyena with Fire Fang, and the second was a Zigzagoon with Charm (Fairy type Attack Down move) These moves will replace the move that occupies the first slot, so in the case of the Zigzagoon, Charm replaced Tackle.
that sounds pretty cool, those are egg moves that they can get through breeding right? that makes it easier to get them without having to go through the trouble of finding a pokemon to get the move from.
on another note, im getting my copy later today when i get off school, and i can't wait! so glad gallade got a mega evolution, now they just need typhlosion to have one and my 2 favourite pokemon can be mega!