The first Poison Pokemon you will be able to catch in these games. With her unique skill to poison by touch, Nidoran can be very helpful at this point of the game, and later on as Nidoqueen.
The male form of this powerful poison Pokemon. When it evolves it can become unstoppable combining Poison and Ground types as Nidoking. It is much easier to catch him in Fire Red; Leaf Green players may want to wait until the Safari to catch him.
#39 Jigglypuff
The well known balloon Pokemon, it got some decent attacks and can learn many kinds of powerful TMs. It evolves with a Moon Rock ,but it shouldn't be used lightly, because when evolved it will not learn anymore attacks by leveling up.