>>28863131Because it was a shitty mechanic that made absolutely no sense whatsoever.
You left you game on and stood in one spot for 4 hours? It's fine, the poison didn't affect your Pokémon at all. BUT IF YOU WALK AROUND, IT WILL FUCKING DIE.
I mean, they could have made it time based, but who fucking cares? It's not like it was a huge problem to cure poison, it takes a single use item that costs what, 200? If you absolutely have to have overworld poison for a Nuzlocke or whatever, just count the fucking steps.
