Okay, so the database isn't allowed to just hand out Pokemon to you to use on a team, however if you find something to start with, post your team on the battle subway on this site, and we can help you revise it. If you want to get more competitive movesets and such, I would recommend looking at our pokedex entries, scrolling to the bottom and clicking on "Good Movesets for ____"
Here you can find good competitive battling movesets and EV and IV spreads. If you need more information on EVs and IVs, and natures, go to the following pokedex pages.
Good luck with your competitive battling.