I have the same problem here, I made a Gothita in Pokegen, after the evolution I wasn't aware of the ability change, now Gothorita has Shadow Tag.
I did everything I read on the forum, the 0x42 is set to 1, I leave the PID blank, I don't know why it shows the hidden ability after the evolution.
Please we need some help here.
How can I fix it?
What am I doing wrong?
I will appreciate your kindness.
Thank you.