Magic Bounce Wall

Clodsire is a specialized wall used to answer a specific set of threats. Clodsire's Poison typing is desirable in a Magic Bounce user because you can shut down common threats like Spikes Flutter Mane, Normalize Flutter Mane, and Fur Coat Strength Sap Zamazenta. On top of that, the Electric immunity makes it very solid against Thunder Cage users such as Miraidon, Arceus-Fairy, and even Take Heart Ice Beam Arceus-Electric to an extent. It's also specially bulky enough to take on threats like special Arceus-Ghost and Specs Pixilate Gardevoir, though both of these will have ways around it especially long-term.

Teleport is standard to slow pivot out, but Bulwark can be used instead; it's a bit awkward to manually switch Clodsire out, but as compensation you get easy burns on RegenVest pivots and deny entry for choiced attackers.

The 4th slot contains several ways of passively applying damage and/or status to the opposing team, causing them to waste more time recovering. Ruination is the simplest choice, indiscriminately pressuring anything it hits including Magic Guard mons, but other things can be used instead. The niche of Lick over Nuzzle is that you can paralyze opposing non-Covert-Cloak Imposter, which otherwise can freely recover on you (Combat Torque isn't a viable alternative because having nothing on ghosts is just terrible).

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Use Clodsire to wall things, sapblock, and grab momentum with Teleport. There really isn't much more to it than that. Obviously remember to apply basic principles, like trying to protect its Black Sludge if it's needed to answer another threat, or freely letting it get low if it isn't needed.

Being a mon with a specialized role, Clodsire naturally has as many weaknesses as it does strengths. Physical attackers force it out, it hates Knock Off, it hates Spikes, it's weak to several semi-common types, it loses to NP Arceus-Steel unless you have specifically Topsy vs. Fist Plate non-Good as Gold.