Gen 7 genning issue

[Burgee2803]

i dont know if im being stupid or what. but no matter what i do to try and evolve an onix in gen 7 it has an error. pics for whats happening. i have tried using different onix as well

[Burgee2803]

for the record i can do whatever i want to the onix, but as soon as i evolve it thats when the issue happens

[Burgee2803]

seemed to work if i traded it and traded it back, so i presume that was the issue since its a trade issue. never had that before my bad

[AlamosIT]

2 hours ago, Burgee2803 said:

seemed to work if i traded it and traded it back, so i presume that was the issue since its a trade issue. never had that before my bad

This.

A Pokémon that evolve through trading has to be seen as "traded" by the game, otherwise it's flagged as illegal. You can "emulate" a trade by drag-n-dropping a mon between two PKHeX windows.