Trapinch - The PU Dugtrio 
Honestly, it's really refreshing to see these little instances of lower tiers mimicking OU, and Trapinch fits that bill quite well. Its ability to take out select, owning the daylights out of some key offensive threats like Arbok, Magcargo, Omanyte, and to a lesser extent Lickitung and Wigglytuff... oh, it also happens to just DUNK on Swalot. You also typically scare off gastly with shadow ball, and even if you don't have a prime target to smack it can be great to help force a KO on specific pokemon with beefy quakeslide coverage. More notably, Trapinch forces a lot of thinking in the builder, because neglecting Baton Pass on important picks like Minun can and will get you owned before the match even starts. How? Trapinch, that's how. The fact that I could change only the names of Pokemon and say something
remotely competent in the context of OU says a lot about how charming this tier can be while maintaining a complex but not-quite-sweaty balance.
Want me to highlight a specific PU mon? Just lmk what mon and why it's the most adorable little war crime this side of Hoenn. I can be found on discord, on smogon, and other places, so don't hesitate to reach out! There's also the
PU Discord Server if you want to lurk in #oldgens and stay up-to-date on all things PU