Gastrodon can also be run with HDB + Sticky Hold. It's good for weak knock offs and tricks.Gastrodon gets U-turn'd + hazard entry, it takes about 25% damage chips and will be force to switch out after U-turn'd without using recover. Despite Dragapult have a 100 SpA base, it's still hit really hard because we have a lack of good counterplays for it. Dragapult has a massive effect on teambuilding. If your team don't have Dragapult and you slap Dragapult for something, your team is likely to get better while Dragapult demands 2 pokemon that can 'check' it on your team.
Also, SpDef Mirror Armor Corviknight is quite solid because it doesn't fear SpDef drops.
I feel like the safest way to defensively deal with pult like how it was for Urshifu-S: have a bulky Regenerator pivot (Pex is good at that). Switch in, scout the move, then switch to the appropriate teammate healing in the process: goes for Draco, switch to fairy type/steel type. Goes for coverage, you have resists or you might just resist it with pex.
When it goes for the ghost move, if you have Mandibuzz, you're golden. If you don't have one,
Or you just use the hard counter