Yes.
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You don't need to catch every Pokemon to complete your pokedex you need to just see them but you can catch all of them if you want to.
Unfortunately, you have to catch, trade, or somehow own every Pokemon in the pokedex. If you had it at one time and traded it, it still is in your pokedex.
you need to find 210 Pokemon to complete the pokedex
You need to get the national pokedex to get national pokedex you need to get all the Pokemon and you need to talk to daun's sister
well to upgrade your pokedex you need to have seen each one i don,t think you need to catch them all