Pokémon Omega Ruby Origins

Origins is a unique ROM hack featuring content never-before-seen in the scene. We aren’t just talking about standard battle mechanics like G-Max, Z-Moves, or Terastallization Origins features its own unique universe and fauna, with 412 species from every region discovered so far.

The story takes place in an alternate Hoenn, diverging from the events of the original games. Something strange is spreading across the region, and it is up to you to explore and unravel the mysteries behind these occurrences. You won't be alone; you’ll have the help of the most powerful trainers in this incredible multiverse!

Source: TheGamesDB