You'll first be told to take name. After choosing your name and watching the introductory cutscene, you will stop at the Outskirt Stand. Enter what appears to be a train engine to see a news report about Team Snagem's hideout being destroyed. Speak with the Pokémon trainer near the back of the bar, and leave.
All battles in Pokémon Colosseum are 2 vs. 2, but the enemy will not inflict much damage.
After the battle, Rider Willie will recommend you visit Phenac City. You can return to the bartender to purchase items:
- Antidote: $100
- Awakening: $250
- Burn Heal: $250
- Ice Heal: $250
- Paralyze Heal: $250
These items will arrive only after you get the free 5 Poké Balls from the shopkeeper, when prompted to purchase Poké Balls.
- Poké Balls*: $200
- Premier Ball: Purchase 10 Poké Balls
- Full Heal*: $600
- Great Ball*: $600
- Net Ball: $1000
These will arrive after you get your first E-Mail from Duking.
- Timer Balls**: $1000
- Ultra Balls**: $1200
- Nest Ball**: $1000