Key Locations:
-The CePlaza Hotel. A humongous and luxurious hotel, feel free to spend a night or two there. It is filled with rich and formidable trainers, so why not fight a few battles and get yourself a load of experience and money? ^_~
-Professor Sycamore's Lab. This is where a certain Pokemon professor studies rare or unusual Pokemon.
-Movie Theater. Want to watch a nice movie with your Pokemon? Be careful of theater thugs.

Obtaining Pokemon:
-Master Star's Galaxy. Not really in outer space, but it's a good place for training. If you can defeat the great Master Star, he may give you a cool new Pokemon...
-Central Oasis. It's not a real oasis since Celinon City is nowhere near the desert, but it's rather an artificial one. Even so, there are some Pokemon who dwell there. Bring lots of PokeBalls!