Ok I've been able to gather some more information, atleast I think so.
-Basically, the trainer has this ability "snatch" and if you got more than a 1s grade education, Im sure you can decipher what it does, but for those who don't. It allows you to weaken your oppenents PokeMon and then take them away, which was never allowed in any of the GB games.
-It seems to contain PokeMon that are unobtainable from Ruby and Sapphire. Once you get them, you can download them into the GBA games and raise them there. (If you are gonna milk, force them to buy, eh?)
-You may be able to play against humans in this moe.
-It is not yet known if it will be similar in fashion to the GB games, but eh.
