Grimer

With the advent of LVL 50 XL Candy, Grimer is at least okay as a Poison-type candidate, boasting a decent movepool and decent bulk with its stats. As expected, it reliably beats Azumarill in all shielded scenarios, though non-shielded hydro pump variants can cause trouble. It can beat most grass types and fairy types, and is able to defeat non-STAB counter pokemon like Scrafty and Deoxys defense. Outside of its role, it struggles to differnate itself from poison types like Haunter or Beedrill, fufilling similar roles without being so expensive and niche. It should generally only be raised if it somehow fills an exact niche on your team.