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It's cool that now mythicals are no longer locked to one time events but they really couldn't create their own unique in-game areas or events instead of just having some random NPCs give you these super rare and powerful Pokemon one badge into the game? Such an odd design choice.
Even Legends which did the whole "save data gives you access to mythicals" thing the best also basically just kinda placed Shaymin and Darkrai in the overworld without a decent quest to go along with it iirc