I stopped playing after silver and gold, but I did start my own gym. I drew and designed my own badge and even drummed up a series of rules. I didn't really have a puzzle, but I did give a brain-scratchingly hard quiz based off of the game/anime.
I based my gym on a yin-yang theme. Half was physical, the other have spiritual/special.
I opened with the physical:
Foretress - Spikes, sandstorm, and explosion to start off with, followed by...
Aerodactyl
and Kabutops? Although I wanted to replace him with a Tyrannitar. I stopped playing before I could breed him with the move set I wanted.
My second half was my favorite half. I actually gave trainers the option of just having a 3 vs 3 match, and this was always my favorite 3:
A Gengar named Deimos: Nightshade, Confuse Ray, Hypnosis, and Dream Eater. This pokemon was pretty much my best friend. I used him to take down Mewtwo's, too!
A Lapras named Neptune: I basically just used Rain Dance and Thunder with this one.
Finally, a Mewtwo named Phobos.
I was one of the only kids in my school that played Pokemon, but I loved it anyway. I had even raised a Poliwrath that knew Mind Reader AND Fissure XD!
But my favorites (besides Gengar) were a Wobbuffet and a Blissey:
I named them Tanha and Nirvhana, respectively. The Blissey I was particularly proud in, because it used attacks like Counter and Bide, essentially using its hit points like ammunitino

.
Gosh this all takes me back. I might just go and dust off my old Pokemon Silver game...