Re: Colosseum Help
Yes, you can get all 3. After you beat that final guy,go to Pyrite town, and fight Cail. Then, you can go to the Snagem Hideout. Go there, and,after Trainer battles, you'll soon fight Rosso/Bluno/Verde. He'll have 1 of the starters you didn't pick. Go to the Shadow Pokemon Lab,you'll need to fight other trainers, the last one will be there.
Info. from guide. Hope this helped