Regarding Move Tutors

I was thinking about replacing my swampwert for a greninja, since I just got to Murk forest, but I can’t complete it’s moveset without Gunk Shot. However, I can’t seem to to find the Gunk Shot Tutor. The Wiki says that he’s in the sewers, but I’ve searched everywhere and can’t find him. Help?

search for him he’s there

go from the department store left,up,right,up,right.up then go left

Thanks!!! I finally found him.