Resident Evil Games on Game Boy Advance: None Official

No mainline Resident Evil released on GBA. Capcom released two GBA titles inspired by RE:

• Resident Evil: Deadly Silence (2004) – Actually a Nintendo DS remake of RE1 (touchscreen knife, co-op). Not GBA.
• Biohazard: Battle for the Sanctuary (2004) – Japan-only GBA action game with RE characters/assets. Not a port.

Actual Portable RE Games

• Resident Evil Gaiden (GBC) – Top-down shooter, canon side-story.
• Resident Evil: Revelations (3DS) – Full 3D survival horror.
• Resident Evil 2 (GBA prototype) – Cancelled; ROM leaked, unplayable.

For GBA horror, try Castlevania: Aria of Sorrow or Metroid Fusion.