Venusaur is a squat, quadruped Pokémon with bumpy, bluish green skin. It has small, circular red eyes, two pointed teeth on its upper jaw, and four pointed teeth on its lower jaw. It has three clawed toes on each foot. The bud on its back has bloomed in a large pink, white-spotted flower. The flower is supported by a thick, brown trunk surrounded by green fronds. A female Venusaur will have a seed in the center of its flower.
As Mega Venusaur, the flower on its back grows larger and two new, pink flowers bloom, one on its forehead and one on its rear. Additional leaves with woody stems are grown around the flower that are supported by vines that grow from the base of the flower. Mega Venusaur also develops darker patches of color on its forehead below the new bloom. Its legs and frame also become more sturdy to support the weight of the flower.
Venusaur uses its flower to catch the sun's rays to convert them into energy, which causes the flower to take on colors that are more vibrant. The flower releases a soothing scent that attracts Pokémon. This scent becomes stronger after a rainy day.