The plot and setting of Omega Ruby and Alpha Sapphire are mostly the same as the original Ruby and Sapphire games. The game begins as the player is seen riding in the back of a moving truck. The player character starts by moving to the Hoenn Region from the Johto Region with his/her mother, as their father Norman has been hired as the leader of the Petalburg City Gym. The player arrives with their parents at the family's new home in the village of Littleroot Town, on the southern edge of the main island. The player character begins their Pokémon Trainer journey by saving Professor Birch, the leading scientist in the Hoenn region, from a wild Pokémon, choosing either Treecko, Torchic, or Mudkip to defend him. Following the defeat of the wild Pokémon, the player receives the chosen Pokémon as their starter. They then travel around the Hoenn Region to complete their Pokédex and battle the eight Gym Leaders of the Hoenn Pokémon League. Along the way, the player character encounters the antagonist group Team Magma in Omega Ruby or Team Aqua in Alpha Sapphire who wish to use the power of the Legendary Pokémon, Primal Kyogre in Alpha Sapphire and Primal Groudon in Omega Ruby, to change the world to suit their desires. Team Magma wants to use Groudon to dry up the oceans to make the world a haven for land Pokémon while Team Aqua wishes to summon Kyogre to flood the lands to suit Water Pokémon. With the help of Hoenn League Champion Steven Stone and the Gym Leader Wallace, the player defeats their respective team and then either captures or defeats the Legendary Pokémon to prevent a global drought/heavy rainfall, and thus ensuring the teams' mutual reformation. The player then advances on to the Pokémon League, challenging the Elite Four and then Steven to become the new Hoenn Pokémon League Champion. The player also has the option of participating in the various Pokémon Contests throughout Hoenn, using their Pokémon to put on a performance for an audience and judges. Aside from the gameplay, 20 new Mega Evolutions were added since Pokémon X and Y to enhance gameplay. A new side quest featured in Omega Ruby and Alpha Sapphire is called the Delta Episode. The player character must work with the new character Zinnia, Steven, and Professor Cozmo to find a way to stop a meteor from crashing into the planet, which requires capturing the Legendary Pokémon Rayquaza in order to stop the meteor which contains the Mythical Pokémon Deoxys.