help

You may have done the battle tower a few times, but have you beaten the tower tycoon? You have win 21 times in a row before you can fight him for the first time. The second time, you have to win 50 times in a row I think. After that, you can head north till you reach Stark mountain, and complete everything over there. After you do all of that, you can try and complete the national pokedex by catching all 493 Pokemon in the pokedex. After you do all that, you can rest.

Aah, this is the only ever part of the game where it begins to get slightly boring. Many of my friends have started again because of this but then many more have decided to try and complete the dex and try to get all their Pokemon possible to level 100 for some odd reason.
You just do odd things here and there once you beat it or if you have Wi-Fi enter the competitions people hold over the internet or battle revolution.
You could even infuriate yourself by slathering as many trees as possible and still only getting combees burmies, theres a stack of things to do with no point.
Or if you havent got the national dex yet you could do that so you can migrate and other stuff like that.

You can fill the nation Pokedex, train your pokemonto level 100, capture 50 flags in the underground and complete Master Rank in all contests. A part from that there is not really anything else that you can do.

Hope this helps =)

Ya, there really isn't much left to do. What I'm doin now is trying to complete my national dex. It'll keep ya busy for a while, I can tell you that.