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Kendo Practitioner, Stage magician/Takarazuka performer. had there been native Ralts in Alola, i could have easily see them adapting in weird ways. Normal/Psychic for Ralts, Fighting/Fairy for Kirlia, Normal/Fairy for Gardevoir and Ghost/Fighting for Gallade. Gardevoir never develops the Trainer-Protection instinct due to Pokemon/Human emotions being near identical as well as the inability to escape preditors due to being on an island. they also never dropped their emphatic abilities, seeking to thrill itself and the world as an audience. (could adopt powders, as well as unusual moves such as Zap Cannon and Flamethrower)
Alolan Gallade gets in touch with its Fae side to attempt to get over the physical inability to strike ghosts, eventually dropping the normal typing, becoming a spectral Swordsman in the process. before Rowlet's line's hidden abilities were revealed, i would have given Gallade a pseudo-sound ability that enables any Sword-based attack to hit ghosts (at least neutrally) as well as give splash damage (against Subs) on the Pokemon itself.
Dawn Stone (female) Kirlia > Alolan Gardevoir. Dusk Stone (Male) Kirlia > Alolan Gallade. when they inevitably bring out the next games, they should just allow Pokemon to evolve whilst holding a Gem to invoke their original typing.
But i guess it'd be complicated to work them in as well as utilize Mega Stones. eventhough dropping one of their types to revert to their originals might grant either inherent weaknesses, moveset changes or even adaptiveness.