Originally Posted by -Zodeon
And is your poke dex upgraded straight after the Pokemon league?
Yes, after you finish the storyline and you're back in your bedroom, go downstairs and talk to the two moms (your mom & Looker). Then go outside. Cheren and Bianca will be outside and the Cedric Juniper will upgrade your Pokedex to the National Dex, no matter how many Pokemon you've seen in the Unova Dex.