Heh yeah. I could imagine them beating Team Rocket's sorry behinds all the way to Timbuktu. That would be cool just to watch them. Although, the fact that the Rockets would have pokemon and them at a lack thereof might cause a bit of trouble.
If the Pokemon characters went to Teen Titans..that would be a whole different story. May, Max, Brock, and Ash would probably use their pokemon to fight evil. Hehe..then a villain like Slade would try to capture, replicate them, and try to 'harness their power'..xDD