Play/battle competitively...
Get starters and other Pokemon to transfer to B/W, where you can battle Wi-Fi
You can complete your Pokedex and get 5 Stars on your Trainer Card...
There really is no point to any video game except entertainment. (Unless you're battling competitively)
But, you wanna capture Diagla and defeat Team Galactic as the main point. Otherwise, there's not much you can do except catch/explore. You might wanna try HG/SS as they are longer with double the gyms, E4, etc.