One I’ve been using for a very long time
Forretress
Item: Quick Clas
Stealth Rock
Rapid Spin/Spikes
Stealth Rock
Explosion
I usually try to just set up hazards when I get the chance, and the Quick Claw is hilarious, letting me get an extra layer up before I die, or letting me kamikaze my opponent when I’m done. The best is when they bring in some booster with low defense, and the turn where they’re about to destroy my whole team, quick claw activates, and I destroy them with explosion. Cracks me up every time.
Another gimmick was my Delibird set. I think it was like spikes, rapid spin, counter, and Sky Attack. He had a focus sash, so I’d try to bait in a physical sweeper, survive the hit with 1 hp, and counter it all back to take out the sweeper. All the while setting spikes. I ran it on a team with Jumpluff for sleep support to allow Delibird tk pull off Sky Attack.