Pokémon Hoenn's Last Wish

A parallel universe where Rayquaza failed to stop Groudon and Kyogre, which caused a natural collapse in Hoenn... After long years of natural destruction, the entire Hoenn region was practically devastated, the era of trainers / pokeballs ended, the pokémons became wild animals, and the nomadic people trying to survive... After years the plot is the millennium comet (Jirachi) and Celebi (time traveler), giving the player an opportunity to go back in time and prevent this disaster from happening... With the return in time, some things from Hoenn destroyed for many years affect the "normal" Hoenn of the past, generating new forms of pokémon, new characters, new villains, gym leaders, etc...