Changes to Hoenn After Ancient Pokemon Battle - Pokemon Omega Ruby

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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Pokemon Omega Ruby and Alpha Sapphire adds Primeval Devolution, new Mega Evolutions, more - Gematsu

Pokémon Omega Ruby & Pokémon Alpha Sapphire Confirmed For Worldwide 3DS Launch in November

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

Pokémon Alpha Sapphire and Omega Ruby are evolutions of classics you remember (reviews)

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

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

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Pokémon Omega Ruby & Alpha Sapphire - Useful Characters

Why Pokemon Omega Ruby and Alpha Sapphire are the Best and Worst Pokemon Games in a Long Time - Feature - Nintendo World Report