I searched and didn’t see a topic on this already, my bad if I’m wrong.
1. Fakie ollies down gaps and stairs. People do them over stuff more often now, but you still don’t see a lot of straight fakie ollies down sets.
2. Backside nosegrinds on rails. It’s a tricky one because it makes more sense to just pinch into a crook or overcrook, but I swear in the early 2000s I saw more back nosegrinds on square rails at least.
3. Frontside full cabs. An easy trick to learn and do with ugly pivots as a little kid, but I think I’ve seen one total in a video and it actually looked sick when done well.