I don't know what to expect from this game. Will it be like PLA where you can catch them without battling them first? Because I personally really like that.
However i checked the website and it states:
So if I were to take that literally, it would mean you can't catch them without battling...
I think basculin is not Hisuian, just regular. Once its evolved it becomes hisiuan. So try spawning in basculin regularly. Not sure if this is correct.