Warning : The migration will only work in PC or Labtop

if Pokemon Nebula 1 is complete then you can import your old pokemon

to Pokemon Nebula 2 in the postgame.

Rewards for the completion of Pokemon Nebula 1:

-The Completion of the main story 

 Rewards: Any starter from Kanto to Galar

-The Completion of the final challenge

 Rewards: Reshiram or Zekrom