I know that an iron valiant set was posted here not too long ago, but I also have a sd iron valiant set that I think has some potential:
Iron Valiant @ Booster Energy
Ability: Quark Drive
Tera Type: Fire
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Swords Dance
- Close Combat
- Knock Off
- Fire Punch
This set allows you to OHKO a lot of pokemon that would normally have a good mu at +2 with tera fire fire punch... and by a lot, I mean just 4 that are fairly relevant, with those pokemon being volcarona(with the standard set, the one running max defense never dies in one hit, but you still beat it), corviknight, amoonguss and scizor.
This doesn't sound like that many pokemon, especially when considering that it still has multiple reliable answers even after tera like great tusk, toxapex, dondozo, etc. but this set is meant to clean up late game after these mons are heavily chipped or gone. Additionally, tera fire also has other benefits. Being immune to burn doesn't seem massive when you already outspeed most will-O-wisp users, but it means it allows you to kill volcarona without risking flame body, which when considering that this mon is designed to deal with it, can be game changing. Additionally, this set allows you to get a free sd from gholdengo(when threatening to revenge kill it)as tera fire means that you take about 60% at most from make it rain and shadow Ball never kills if gholdengo isn't specs or is at +1 or higher. This set also gives you a solid chance at beating spdef dirge, especially if it hasn't already been knocked off, and it's not just good at melting scizor, but it's also good at preventing scizor from melting you with bullet Punch. There are probably more applications to this set, but these are the main ones I can think about.
I want to end this post by saying that iron valiant, an already amazing pokemon, has an insane amount of potential as it's fairly unexplored compared to the tools it can bring to the table. Sd for example only really requires sd, cc, and knock off, and you have a ton room for experimentation in the last slot on that set alone. We even saw tera water liquidation at spl (which btw, is the thing that inspired me to make this set, so shout out to talah for using it), showing that sets like this aren't a gimmick, they're legitimate ways of abusing iron valiant's amazing movepool to great effect and make sets that have the element of suprise, but don't require you catching the opponent off guard in order to work.
I'd love to see someone try to make this firefighter (terrible pun intended) work!
Edit: fixed some typos and added a few things I forgot to write about