Vogol's Art

(via https://www.youtube.com/watch?v=bNjEFgsIIIY)

Some Gen 1 bugs I’ve always been fond of! 

Leech Seed and Toxic in Gen One share similar algorithms and since Toxic was an almost universally teachable move, it can be given to Pokemon that know Leech Seed. Because they share similar algorithms the Toxic algorithm overrides Leech Seed causing Leech Seed to adapt Toxic’s “badly poisoned” properties (doubling HP lost overtime).  There was one trainer in Pokemon Stadium who actually EXPLOITED this technique.