This week's Pokémon is... Bulbasaur!
It evolves into Ivysaur starting at level 16, who evolves into Venusaur starting at level 32.
Bulbasaur is a reptilian creature that somewhat resembles a toad or a young dinosaur with a spotted blue-green hide. Its eyes are a bright red, but the most notable feature of this Pokémon is the onion-like bulb on its back. This bulb has a symbiotic relationship with the Pokémon, growing from a seed planted on its back by its mother at birth. Unlike the parasitic tochukaso mushrooms growing on the back of Paras, which eventually take over its body as it evolves into Parasect, Bulbasaur's bulb shares a symbiotic relationship beneficial for both. This allows Bulbasaur to get an enhanced boost of energy from the sun during the day and the bulb to remain growing and strong at night. The bulb also contains many seeds, from which it draws nutrients.
Though they usually walk on four legs, a Bulbasaur can rise up on its hind legs. When it evolves into Ivysaur, the bulb becomes a larger flower bud, and it loses this ability. This, in turn, causes Ivysaur and Venusaur to lose speed.