i've been trying an unga bunga sun tera fire band set and literally nothing is capable of safely switching into it. it's a physical chi-yu and that isn't an exaggeration. here are the calcs:
252+ Atk Choice Band Protosynthesis Tera Fire Gouging Fire Flare Blitz vs. 252 HP / 4 Def Ting-Lu in Sun: 634-746 (123.3 - 145.1%) -- guaranteed OHKO
252+ Atk Choice Band Protosynthesis Tera Fire Gouging Fire Flare Blitz vs. 252 HP / 252+ Def Protosynthesis Great Tusk in Sun: 352-416 (81.1 - 95.8%) -- guaranteed 2HKO after Leftovers recovery
252+ Atk Choice Band Protosynthesis Tera Fire Gouging Fire Flare Blitz vs. 252 HP / 192+ Def Toxapex in Sun: 214-252 (70.3 - 82.8%) -- guaranteed 2HKO after Leftovers recovery
252+ Atk Choice Band Protosynthesis Tera Fire Gouging Fire Flare Blitz vs. 252 HP / 156+ Def Garganacl in Sun: 247-291 (61.1 - 72%) -- guaranteed 2HKO after Leftovers recovery
252+ Atk Choice Band Protosynthesis Tera Fire Gouging Fire Flare Blitz vs. 252 HP / 252+ Def Alomomola in Sun: 319-376 (59.7 - 70.4%) -- guaranteed 2HKO
252+ Atk Choice Band Protosynthesis Tera Fire Gouging Fire Flare Blitz vs. 252 HP / 252+ Def Dondozo in Sun: 252-297 (50 - 58.9%) -- guaranteed 2HKO
slightly more sun-dependent for the damage output than chi-yu was, but the fact that it can 2hko dondozo with a resisted physical attack makes me think that there might be a problem here
Actually, why not run Raging Fury instead? Wouldn't it be better to opt for over Flare Blitz thanks to the lack of recoil?