Well i have an idea for our necrozma how we do it after capture solgaleo or lunala necrozma will appear like in canon game and fight with solgaleo /lunala to turn into dusk mane necrozma or dawn wing necrozma and escape in which you need to find the other cosmo to evovle which to solgaleo or lunala and chase necrozma in her dimesion which he relase and turn to other fight to fight you which it last stage is ultra necrozma which í the form you will breed necrozma
Viewing post in The Legendary Pokemon Breeder comments
Let me make sure I've got this right.
MC gets Nebby to evolve into Solga/Luna.
Necrozma steals them away and turns into the mixed form.
MC gets the other Legend from the other universe and uses it to hunt down Necro.
Necro takes that one too and becomes Ultra Necro.
She splits apart back again after she's been beaten/bred.
Is that about right?