Same for Electebuzz, I know I could just make them evolved but I'm just curious.
This is because it still transfers through GTS. Additionally, I just got Pokegen and trailled it myself so yup it works perfectly fine. :D Magmortar yay!
Except boo, It's nature is adamant. I forgot to change it >.> lol
It should do that, since you say it comes from the GTS.