Anyone not having luck transferring pokemon from home?

So the game tells you which pokemon are eligible to be transferred to champions but I select a bunch of eligible pokemon and it tells me “one or more pokemon cannot be moved to Pokemon champions”.

1. Which pokemon is the game having issues with?

2. And why?

Surely these would be basic things the game could tell you.

Otherwise very disappointed with the amount of pokemon available at launch. And don’t get me started about the terrible frame drops and janky menus seeming slow