Originally Posted by Fat Molk
TL;DR plz dont add tentacool, everything else is fine
I wouldn't use it as a wall for the horrid Defense and HP stats. Decent SpD, Rapid Spin, and the wholly ignorable Toxic Spikes are the only real things it has, plus it practically requires Barrier as well, limiting it to one potentially useful move, which is usually Giga Drain or Surf, neither of which fares well with Tentacool's 50 base SpA. It is in every respect inferior to the likes of Audino, Lickylicky, and Musharna, each of which can function independently and has a good support movepool. If you want a Poison-type wall, Amoonguss doesn't require any creativity, and Vileplume and Weezing are there for the hipsters, complete with convenient abilities. If you want entry hazards, you'd literally be better off running Maractus, and that's pretty sad.