Gigantamax flag mismatch on starter

[Jackalope]

So right after getting my starter, I tried editing to give him a gigantamax factor but am getting the flag mismatch error. Having the starter at level 7 with g-factor should in theory be possible, if I just did not use it at all until I give it max soup right? Or is there something else I'm missing?

[Atrius97]

Max Soup can only be fed to fully evolved Pokémon that can Gigantamax, excluding Melmetal which cannot eat Max Soup at all.

The only pre-evolved Pokémon with the Gmax factor are from past events, or in-game gifts such as the G-max Charmander gifted to you in post-game.

Edited November 24, 2022 by Atrius97