Where to find a drifbloom?

After you defeat Team Galactic in Floaroma Town every Friday Drifloon is there in front of the Valley Windworks talk to it and it will start a battle with you at which point you can try to catch it however it's a Level 22 Drifloon. Once you've caught it you can evolve it at Level 28 if you want to evolve it into Drifblim.