>>35809144The Tapus are Mimikyu that made costumes out of legitimately divine relics ages ago to try to be special to/garner love of the alolan people and unnaturally evolved. Similar to Rotom forms, they lost their ghost typing and gained ones based on the force within the totem.
Tapu Bulu's uncharacteristic action against the mega mart on Akala was to create a habitat for the few remaining Mimikyu in the modern age.