Clodsire

Great League: 4.5/5

Clodsire is extremely tanky, boasting bulkiness that is comparable to that of Registeel and Azumarill. While it lacks good Fast Attack pressure, it can consistently reach its fairly expensive Charged Attacks to overwhelm opponents. A wide array of coverage afforded by Earthquake and either Stone Edge or Sludge Bomb ensures that only a few Pokemon can handle it safely. Additionally, its rare Poison/Ground typing allows it to resist Registeel's Zap Cannon and Focus Blast, making Clodsire one of the few safe counters to the titan.

With that said, Clodsire does have its fair share of weaknesses. Gligar walls Clodsire, and not even Stone Edge can really get past it. Weaknesses to Water, Ice, Ground, and Psychic can give Clodsire a difficult time against major meta threats such as Swampert, Alolan Sandslash, Dewgong, and Medicham, although out of these, only Swampert can safely handle it.

Ultra League: 3 / 5

Clodsire doesn't hit the CP cap of the Ultra League, but its stat product is not terrible, being comparable to that of Nidoqueen's. Unfortunately, that also means there isn't too much reason to use Clodsire over Nidoqueen, whose access to cheaper Charged Attacks and Poison Jab makes it a much more reliable option. 

Master League: 0 / 5

In the main series, Clodsire can remain somewhat usable in high-powered metagames by utilizing a combination of its bulk, wide array of supporting moves, reliable recovery, and good abilities. However, that is not an option in Pokemon GO, which strongly favors more direct combat.