Sorry for double posting, but this comment is completely unrelated to what i wrote above. Would azumaril be helpful? From what I understand, a lot of current stall teams struggle with fighting and dark. Azumaril just so happens to take both of those very well. Azumaril also has resistances to ice and fire which are two commonly used elemental punches on fighting types and takes neutral damage from rock and steel and resistance to ice which commonly accompany dark type attacks. Azumaril has access to moves like perish song and encore to prevent sweeps, hits hard enough to chip away at opponents on a switch, and has one or two immunities (depending on how much you care about its offensive prowess). This all comes with a respectable 100-80-80 defensive spread and the ability to dispatch weakened threats with aqua jet. Azumaril does suffer from a lack of recovery options and isn't the bulkiest Pokemon in the game, but it seems like an interesting option for anyone with a stall team that struggles against things like conkeldurr, weaville, defensive water types, defensive ttar builds, etc. While I certainly don't expect azumarill to become a stall staple, I do believe it could be an interesting add onto a few teams that run cleric support that struggle against many of the threats I listed.
Wouldn't Mega Venusaur be better overall? His 100/123/120 bulk and typing in combination with Thick Fat lets it handle most Fighting types given any coverage that they use whether be it Fire, Ice, Dark, etc. And unlike Azumarill, M-Venusaur has reliable options for recovery in the form of Synthesis and Leech seed.
EDIT
Some Calcs:
180 Atk Life Orb Infernape Flare Blitz vs. 252 HP / 4 Def Thick Fat Venusaur: 174-205 (43.06 - 50.74%) -- guaranteed 3HKO (Goodness gracious)
252+ Atk Life Orb Sheer Force Conkeldurr Ice Punch vs. 252 HP / 4 Def Thick Fat Venusaur: 135-161 (33.41 - 39.85%) -- 25.68% chance to 3HKO
252 Atk Choice Band Terrakion Stone Edge vs. 252 HP / 4 Def Venusaur: 204-240 (50.49 - 59.4%) -- 80.08% chance to 2HKO
252 Atk Life Orb Weavile Ice Punch vs. 252 HP / 4 Def Thick Fat Venusaur: 127-151 (31.43 - 37.37%) -- guaranteed 4HKO
And that's even without Defense investments.
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