Do I have to have legal Pokemon when using a PKHeXed save file?

[BigChickenMan]

I was wondering if the pokemon that I PKHeX into my save files are required to be legal. For example, teaching Dark Pulse to an Emboar. I was curious and was hoping that I could use illegal pokemon so that I could cover all my weaknesses within a single movepool .

[theSLAYER]

you can have illegal mons on PKHeX, they'll just be flagged illegal. Thad doesn't stop PKHeX from functioning.