Here's my thoughts on this. The Team will be a pokemon group bent on taking over the region at first, then of course the world, but no one will know at first, except well after the first time you meet them. The team will be the research center in the region dealing with DNA, researching pokemon like Deoxys, Mew, Arceus, and so on and so forth. Their focus that is clear is that they want to find out what makes a legendary pokemon, legendary, so they focus on those, and try to deduce the Legendary Pokemon Gene. Now their hidden ideals, is where they are planning to use the gene to create legendary pokemon out of non-legends, Absol, Volcarona, Zoroark, and so on and so forth. Well you first figure this out when you visit their town at the third or fourth Gym leader, since they are always the one to have a major town with their gym lately. Anyways after you meet them the first time, your impression is probably going to be alright they aren't a bad team, finally no annoying battles. However they have another Alias, or Name they go by when stealing pokemon, depending on the game the names will switch, either way, they are both evil. So you actually met this team before under that alias, but they always talk about the False Team in a negative way, this is meant to be done, due to them trying to hide. Well at about your fifth or Six badge depending when you meet them, they start up their true plans, and you end up having to go stop them from going after the Mascot Legendary pokemon. They head for the pokemon that could be related to summon the legendary pokemon from their slumber, create them from nothing, or other ideas. After catching said pokemon, they say they have gotten enough data to summon the pokemon, and then they head to the "Legend Area", but you can't get there yet. After your seventh badge they will have summoned, but not successfully tamed said Legendary pokemon, but you finally have your access to it, however you have to go fight their boss in the main HQ, because he hasn't moved through out the game, of course you've met him before, him just acting like everything's normal. Anyways after you finally beat him, there's his speech on how he's going to make this world in his own image or the speech about what they are planning, you know normal Team leader stuff. After this, now you can head to the legendary area, due to the Leader heading that way. Now like every Legend Area, you can fight pokemon and train there, and probably should since the leader will be stronger then when you fought him at the HQ. You'll fight him then at the end of it, you'll finally get the prize of the game, Pokemon X or Pokemon Y.