Custom Robo Arena Cheats
Ray MK II Robo
By winning the Great Robo Cup. Then, go talk to your father at his lab.
By winning the Great Robo Cup. Then, go to the Team No.1 Clubhouse. Talk to the boxes above the stairs to begin a battle. Defeat your opponent without using a combo that gets over 380 damage.
By winning the Great Robo Cup. Then, go to the police station. Talk to one of the people at a rear desk to buy the X-Ray Robo for 50,000 credits.
After getting the dark commanders mark from the hologram grudge battle go to the underground buy the Ray Sky battle stark and win to get the AIRS.
Hadron and illegal parts
After getting access to the underground buy 20 illegal parts use all of them. Battle a person at a holluseme deck in the underground and you get the Hadron gun, Hadron bomb, Hadron pod, and Hadron legs!