you get to fight ash, but he apears as pokemon trainer red.
Complete the Unova pokedex (after that coplete the national pokedex)
go to undella and fight Cynthia or finish the pokedex
There are 300 Pokemon in the Pokemon Black 2 and White 2 Unova Pokedex.
The National Pokedex of Black or White.
In pokemon black it is landorus
You have to beat the game once and then your pokedex will be upgraded.
Lampert.
There are 649 pokemon.
150. but the natinol pokedex has 643.
The 3D Pokedex is completely free.
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Ferrothorn