I had a idea for a questions part of a legendary as long as there is one that could shape shift or create illusions. The MC would be asked to identify a Pokémon they change into or conjure up but they could not use their eyes or hearing but feel, smell, and maybe taste to get clues of which pokemon from the options available is correct. If it seems good enough then the legendary could have the MC not use there hands to feel but their face to feel, taste, smell if it seem like that could work. Some of the hints could be hot temp, icy, furry, scaly, heavy etcetera. The legendary could have a little bit of a S&M personality where each time the MC gets it wrong she kicks him in the balls (ouch) thus a decrease in health but if correct then he becomes the master. This just reminds me of the "Who's That Pokemon" that would appear in the early cartoon seasons as it was going to commercials. If no legendries meet this well just wanted to put this idea out before I forget it.
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Thank for considering it! It could work if a legend could control other pokemon or looks like royalty ,you know, is used to being in control of others and having things done for them. Closest one that looks like royalty or at least a beauty queen is Pheromosa. She is a fight type so her getting other pokemon to do her bidding is plausible and she almost looks like she wears a crown on her head for the royalty vibe.