Custom Robo Codes -

Sudden Death stage:
Win the Robo Cup, then enter one of the laboratories on the upper floor of NeoBrain. Talk to the scientist facing the glass and defeat him to unlock the Sudden Death stage for purchase.

The Underground stage:
After winning enough Grudge matches, go in front of the clubhouse and defeat your shadow self to get illegal parts and the Dark Commander Mark. Talk to the suspicious man in the southwest house in the Bayside area to access a secret passage to The Underground.

Carat Robo:
Complete all the Robo type Mission battles, then defeat Catoreya.

Hadoron Robo:
Complete all four Greyham Boss data and Hadoron data to unlock Hadoron and his parts.

Hiykko Robo:
Win 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.

Meijel Robo, Nanase set and key to the Underground:
Defeat your shadow self aboveground.

Minstrel Robo:
Defeat Hajime in your classroom after he brings Saki to school.

Ray and Sagittarius Gun Robo:
Defeat Saki in your classroom after she returns.

Ray MK II Robo:
Win the Great Robo Cup. Then, go talk to your father at his lab.

Ray II Dark Robo:
Defeat your shadow self in the underground for the second time.

X-Ray Robo:
Win 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 $500 or 50,000 credits.