[Eventing Question] Tile that poisons follower Pokémon

go through a pool of poison, and stick with the pokemon that is out of the poisoned pokeball

Im not quite sure what exactly you want, but you can poison a pokemon using the Pokemon Manipulation script area of the Wiki. An example:


Pasting this script would define pkmn as the first member in the party and then poison that Pokemon

If on the other hand you want to simply add a poisoned pokemon, then you can give a Pokemon to the Player by using