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Here's my favorite Gen 2 bug: CLONING! You first save in a Pokemon Center near the PC. Make sure the Pokemon in your party is holding the item you want to copy with it. Make sure it's saved after that so you can do this multiple times. Then put that Pokemon in a box and change the box to...
I taught it HM moves like Surf, Whirlpool, and Waterfall. I don't call it a HM Slave for it. I still used him in battle as a water type. Kept it on the same team to the very end.
Mine is a Rock/Ground type gym leader who comes from the mysterious Saturn region, a large island surrounded by rocks keeping it isolated from the rest of the world. I've also got a funny idea for Segata Sanshiro as a guest character who trains only fighting types too.