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

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Pokémon Alpha Sapphire and Omega Ruby Review - IGN

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Changes to Hoenn After Ancient Pokemon Battle - Pokemon Omega Ruby

Changes to Hoenn After Ancient Pokemon Battle - Pokemon Omega Ruby

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Changes to Hoenn After Ancient Pokemon Battle - Pokemon Omega Ruby