When I first saw it I thought it was something related to Mawile tbh haha just because of the head area and because I was on my phone so couldn't see it that well lol. I definitely see it as Water/Poison as well. Could potentially be a Pyukumuku evo given the spikes.
At first I thought it looked just like Tsareena... However, it could also be a Pyukumuku evolution. If the latter is the case, I'll use Pyukumuku on my Litten team, and maybe Wishiwashi has a chance on my Rowlet team.