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How do we make dex completion more fun?
Dex completion is just mindlessly wading through random encounters waiting for the right Pokémon. That is, when you don't just transfer your living dex from previous titles into the new one.
How do we make it more engaging?
I think more Pokémon should be tied to sidequests and can only be obtained if you complete them. Also have more unique ways of catching Pokémon like Wimpod in SM, Falinks in SWSH, the Galarian birds, etc.
Legends is a game based on dex completion so I hope they make it fun.