| > Worth noting that toxic gets downgraded to regular poison after switching out, which does 1/16th of damage every turn, and blocks other status like paralysis or sleep. > Leech seed would probably not do much No, that is incorrect and exactly my point of the argument (and therefore the reason why you would've failed my website's captcha check). The first editions we're talking about had a bug which meant that if Toxin is used first, then Leech Seed does an additional damage per round. And it's ever increasing because the multiplier of Toxin was applied to Leech Seed, which no defensive attack can counteract except Rest (and a Relaxo that had enough HP to survive a second attempt of Toxin+Leech Seed stacking). Note that leech seed will literally in this combination also restore more than 100% HP of Venusaur even when the targeted Pokemon has only 1hp left, each round, making Venusaur almost unbeatable without a Pokemon that has Psybeam and both a high special attack value and a high speed value like Mewtwo, Mew, or Gengar. Detailed explanation of how the function behind it works: https://bulbapedia.bulbagarden.net/wiki/Toxic_%28move%29 for sake of reference: (N * max(1, int(0.0625*MaxHP))) Note that this was fixed specifically in later editions of Pokemon Stadium and second generation editions, wherein Toxic / bad poisoning and leech seed will reset the counter to 0 each round, whereas the counter was ever increasing in the first generation. - - - - - - - - It's kinda funny that we have arrived at a generational knowledge transfer problem, in Pokemon. Google's results without specifically searching for "bug" or "glitch" will happily generate bullshit answers about this topic, always referring to newer editions and their online documentation. Some results that were talking about this bug, just search for "pokemon red leech seed toxic bug": - https://gamefaqs.gamespot.com/boards/907714-pokemon-blue-ver... - https://www.elitefourum.com/t/pokemon-red-blue-yellow-glitch... - https://www.smogon.com/forums/threads/gen-1-glitches-and-how... - https://glitchcity.wiki/wiki/Leech_Seed_and_Toxic_stacking |