Hello,
Does anyone know a reliable answer to this Iron Moth set?
1. Using tera on your Glowking is often worthwhile to beat an Iron Moth if it has committed tera as well. I run Psyshock+Ice Beam as it covers both Non-Tera and Tera Ground/Grass Moth, while also being useful vs Gliscor switchins.
2. Ting Lu can phase out all sets of moth including energy ball, you just need to ensure you aren't taking unnecessary chip before moth commits its booster. Alternatively, you could run Rest to ensure longevity, as you can take 2 hits from moth comfortably while sleeping and phase it out in the third turn. Calc - 132 SpA Tera Grass Iron Moth Energy Ball vs. 252 HP / 252+ SpD Vessel of Ruin Ting-Lu: 180-212 (35 - 41.2%) -- 68.7% chance to 3HKO after Leftovers recovery. Worst case scenario, moth commits to tera grass while you are chipped down and you burn your tera on ting lu to reliably phase it out.
These are my favorite checks to moth on bulkier teams. HO has a wider variety of ways to deal moth, be it priority/faster booster mons.