These don't necessarily have to be competitively viable or reliable, just entertaining in one way or another.

I'll start:

Juice Machine (Magnemite) @ Berry Juice
Ability: Sturdy
Level: 1
EVs: Don't Matter
IVs: Don't Matter
- Recycle
- Toxic
- Protect
- Swagger

A set that I have seen used a couple times on showdown, but I prefer to use this on the battle spot. Sturdy + berry juice guarantees 2 active turns (unless you're faced with fake out users, multi hit moves, or entry hazards) and lets you set up a toxic. Enemies that don't have status (or the aforementioned obstacles) can be stalled indefinitely by spamming recycle/protect. Battle spot players will often panic and switch out, allowing you to regain your berry juice for another toxic setup. I generally like to send out this little guy first in battles spot matches to guarantee at least
one kill and another status.