It looks like may be getting another Mythical Pokémon in the future, and it's reported to tie in with the next movie to release. just received Pecharunt as a new Mythical Pokémon, a Poison/Ghost-type that appeared in the epilogue to DLC after the main story concluded with Receiving another would double the amount of Mythical Pokémon that can be natively acquired within the game, as Pecharunt is currently the only creature to qualify.