For example:
/ds grass,undiscovered,gen4 returns
Arceus-Grass, Budew, Shaymin
/ds grass,undiscovered,gen4,allforms should instead return:
Arceus-Grass, Budew, Shaymin, Shaymin-Sky
/ds grass,undiscovered,gen4 returns
Arceus-Grass, Budew, Shaymin
/ds grass,undiscovered,gen4,allforms should instead return:
Arceus-Grass, Budew, Shaymin, Shaymin-Sky