Roundabout

Yeah I get that I already recruited almost all of them. The problem is that the one in acquamarine cave isn't there

Hi, I was doing the Poliwag Troupe quest and found all of them except the one in acquamarine cave. I searched for the poliwag in the lighthouse zone ( the one in the cave ) for something like 1 hour and I don't know if I'm messing up something. Could someone provide to me a screenshot of where the poliwag is? Or if there's something that triggers the spawn of the poliwag.