002-Ivysaur

Pokedex entry:
#002
Ivysaur (Fushigisou/フシギソウ) Bulbasaurus Ivus
Classification: Seed Pokémon
Height: 3’03” (1.0m)
Weight: 28.7lbs (13.0kg)
Type: grass/poison
When the bulb on its back grows large, it appears to lose the ability to stand on its hind legs. To support its weight, IVYSAUR's legs and trunk grow thick and strong. If it starts spending more time lying in the sunlight, it's a sign that the bud will bloom into a large flower soon. The bulb on its back grows by drawing energy. It gives off an aroma when it's ready to bloom.
(reference from Serebii.net and Bulbapedia.net)