Been playing around with Pechurant and I think it's a hilarious mon. A trolly, bulky spinblocking + Parting Shotting mon like this has a lot of utility on HSam + Lando-T teams, since it makes these guys better at absorbing hits, can keep hazards on the field with its good bulk, and can debuff other guys like Ting-Lu so stuff like Hat has an easier time fending them off. I think being a parting shot bot + spinblocker is a good enough niche, but this mon has some other troll utility with malignant chain + Poison puppeteer letting it cripple some switch-ins like Tusk, Ting-lu, and Lando-T. I've even used it as an emergency endgame tera gambit check with Tera Fairy + malignant chain to fish for poison.
I guess one major issue is that a mon like this feels like it fits on specific team structures. Hsam, Lando-T and Hatterene seem like mandatory partners in order to not autolose to stuff like Gliscor or Gambit.