Pokemon Pigment Ruby [best] -

Pigment Ruby is a ROM hack of Pokémon Ruby that completely overhauls the battle and catching mechanics. Gone are Grass, Fire, and Water. In their place is a spectrum of 12 "Pigment Types" (Crimson, Saffron, Viridian, Cobalt, Magenta, etc.). Every Pokémon now has a primary and secondary pigment, and moves mix those colors to determine effectiveness.

Pokémon Pigment Ruby isn’t just another Hoenn re-tread; it’s the art school AU no one knew they needed. By swapping type-based combat for a color-based chemistry system, this hack breathes explosive, unpredictable life into a 20-year-old region. Just be ready to take notes—or cry when your "crimson" blend creates a Fire-type instead of the Dragon you wanted.