Originally Posted by Belphybear
The reason why those Pokemon are banned is because they can KO at least 2 or 3 Pokemon if they are sent out, and that makes the metagame broken.
Yeah but take Mewtwo for example(since I've played first generation more then I have second and quit at second). I use Parasect/Exeggutor vs players with it using a combo of Sleeppowder/Spore(never miss version of powder for Parasect <3) use Substitute then start using Megadrain while powering it up with Growth. With Exeggutor I did it with SP, Leechseed and Doubleteam and then have either Rest or Toxic in forth slot and that can kill a Mewtwo with ease. Same thing can be done with Tangela as well if you want more defense.