Disclaimer: I did not draw these Pokémon nor do I know who drew them, I cane up with the names and typings and any similarity to the original artists intentions was not intended
Cosmosis
Type: ghost/fairy
Backstory: cosmosis is Said to be the mother of mega evolution, before she was reborn she lost both her wings birthing anuba and iceisa, she was defeated by anuba after turning against the very Pokémon she helped she was then reborn as she is now
Ability: mega dust (Pokémon can't mega evolve when she's around)Anuba
Type: dark/steel
Backstory: anuba was created when cosmosis lost its wings and when cosmosis turned against Pokémon anuba fought against cosmosis and iceisa defeated cosmosis and staying forever locked in combat with iceisa
Ability: mega boost (boosts the stats of a Pokémon holding a mega stone by one stage each, only affects one Pokémon)
IceisaType: ice/bug
Backstory: born when cosmosis lost its wings she sided with cosmosis when it turned against the Pokémon it had helped it stays forever locked in combat with anuba
Ability: mega freeze (lowers the stats of one Pokémon on the opposing team that is holding a mega stone by 1 stage each