I've always considered legendary Pokémon to simply be very rare and unusually powerful. They're not unique (except maybe for the artificially created Mewtwo and Genesect; Mewtwo's clone origin lore is too ingrained in me to ignore, and while I don't care about Genesect, it has its Drive thing...
I'm curious how many people have considered making changes to the existing Pokémon evolutionary families. I'm not talking about just changing evolution methods or adding a new evolution/prevolution. I'm talking about things like removing a species altogether (while keeping the ones that used to...