Worry Seed

In Pokémon ChampionsGen IV

Game

Pokémon Champions

GrassStatus

The target's Ability becomes Insomnia.

Power: –
Accuracy: 100%
PP: 10
Hits: One Pokémon next to the user

Changes over time

How Worry Seed changed from game to game, newest first.

Gen IX
… System, Schooling, Shields Down, Stance Change, added: Tera Shift, Truant, added: Zen Mode, or ~~dropped: Zen Mode.~~ added: Zero to Hero.
Gen VIII
… Fails if the target's Ability is added: As One, Battle Bond, Comatose, Disguise, added: Gulp Missile, Ice Face, Insomnia, Multitype, Power Construct, RKS System, …
Gen VII
… Fails if the target's Ability is added: Battle Bond, Comatose, Disguise, Insomnia, Multitype, added: Power Construct, RKS System, Schooling, Shields Down, Stance Change, added: Truant, or ~~dropped: Truant.~~ added: Zen Mode.
Gen VI
… the target's Ability is Insomnia, Multitype, added: Stance Change, or Truant.
Gen V
… Fails if the target's Ability is ~~dropped: Multitype~~ added: Insomnia, Multitype, or ~~dropped: Truant, or if the target is holding a Griseous Orb.~~ added: Truant.

Numbers: PokéAPI’s changelog. Descriptions: Pokémon Showdown’s for each generation, PokéAPI’s notes where Showdown’s don’t differ. Champions: Pokémon Showdown.