How to unlock Final Emperor

Answer: defeat the demon form in Inverse Grelon

Final Emperor unlocks when you defeat the demon form in Grelon on Inverse Emerald Diorama while playing as Bonnie Blair or Formina Franklyn. Either of those two characters satisfies the character requirement.

Steps

1. Unlock Bonnie Blair or Formina Franklyn.
2. Select either character.
3. Enable Inverse mode and start Emerald Diorama.
4. Travel to Grelon using the inverted layout.
5. Defeat the boss's demon form.

If Final Emperor does not unlock

• Use Bonnie Blair or Formina Franklyn.
• Use Inverse Emerald Diorama rather than the normal version.
• Confirm that the area is Grelon.
• Defeat the demon form rather than stopping at an earlier phase.

Next guides

• How to unlock Bonnie Blair
• How to unlock Formina Franklyn
• Emerald Diorama character order

Sources

• GAMEX: Emerald Diorama guide
• Prima Games: How to Unlock All Characters

Sources rechecked: October 24, 2026.