Jynx

Jynx is a high-risk, high-reward type of Pokemon. Its Special Attack, Speed, access to Lovely Kiss, and combination of STAB attacks that is scarcely resisted in GSC OU make it a great sweeper and status inducer. It 2HKOes a huge number of the viable offensive Pokemon in the metagame, which can force somewhat of a passive response, allowing the Jynx user to gain momentum. Jynx is the only sleep inducer that straight up 2HKOes the most common sleep and general status absorber, Zapdos, and can even take it on one-on-one without relying on Sleep Talk rolls going in its favor. In the absence of one of a few specific viable Sleep Talk users, like Snorlax or Vaporeon, opponents must often effectively sacrifice one Pokemon to sleep and then have an additional healthy Pokemon capable of taking Jynx on. However, Jynx also comes with significant liabilities, which are its frailty, due to its poor defensive typing and stats, and its almost total uselessness when inflicted with status. These traits make it difficult to bring in at times. Nevertheless, Jynx has changed the way that offensive teams are structured in GSC OU and has gone from a niche pick to a metagame standard.