Changes to Hoenn After Ancient Pokemon Battle - Pokemon Omega Ruby and Alpha Sapphire Guide - IGN

After defeating Kyogre or Groudon in the Cave of Origin, Hoenn will change drastically. The first thing you should do is visit Professor Birch in Littleroot

Changes to Hoenn After Ancient Pokemon Battle - Pokemon Omega Ruby

Changes to Hoenn After Ancient Pokemon Battle - Pokemon Omega Ruby

See How Hoenn Has Changed in Pokemon Omega Ruby & Alpha

Pokémon Ruby and Sapphire Versions - Bulbapedia, the community

Changes to Hoenn After Ancient Pokemon Battle - Pokemon Omega Ruby

What's old feels new again in Pokemon Omega Ruby and Alpha Sapphire

Changes to Hoenn After Ancient Pokemon Battle - Pokemon Omega Ruby

Pokémon Alpha Sapphire and Omega Ruby Review - IGN

Changes to Hoenn After Ancient Pokemon Battle - Pokemon Omega Ruby

Changes to Hoenn After Ancient Pokemon Battle - Pokemon Omega Ruby