Elequence

@HappyMango Thank you for the concrete answer, that's all I needed.

I did beat Horon without letting a pokemon faint though. Are you saying I have to do it again in 3 days to get Alucard to respawn?

I'm having this same problem. I don't know where to go from here so I guess I'm just stuck hunting until someone figures this out.

So I messed up my initial catch of Darkrai so I beat Heron to respawn him. All good, caught Darkrai, everything is great. The issue is that in the Gengarite quest I don't have an Alolan Rattata/Cubone and only have 3 pokes which makes it nearly impossible to complete. I thought I was supposed to be able to enter the dark realm again after beating Heron but Alucard doesn't spawn again and I don't know another way in. Any assistance is appreciated.