What's the strangest and most fun strategy you have ever come across?

I'm talking strategies that could at least work in a lower power level format.

In my case, it has to be the trick room plus gravity shenanigans. Getting to demolish my opponents with hustle flapple and Zweilous of all things, with eviolite bronzor as my setter, or even use hypnosis-hex spiritomb is some of the most fun I've ever had in this game.

I even got featured once in one of pokesports videos using hustle flapple and bronzor and the guy was completely flabbergasted!