Venusaur was a quadrupedal, reptilian Pokémon, much larger than its pre-evolved form. Its skin was blue-green, and the dark patches of its earlier form had been replaced by bumps resembling the warts on a toad's back. It had a pair of ears on top of its head with red interiors, and its eyes remained orange-red. In addition to the two sharp upper fangs it had before evolving, two small fangs had grown on each side of its lower jaw. The bud on its back had now bloomed into an enormous flower, supported by a pale brown structure resembling a palm tree trunk. The flower consisted of six red, trapezoidal petals and a yellow, crown-shaped center. Each petal had two triangular notches at its tip and three irregular white spots, while the center had eleven points. As with its pre-evolved form, four large, banana-like leaves grew from the base of the "trunk" in a cross formation, extending over its head, behind it, and to either side of its body. Each foot had three toes tipped with white claws, and its legs had grown thicker than Ivysaur's. Females had a seed on their flowers.
The flower on Mega Venusaur's back had grown even larger, and its increased weight had made the waist and legs supporting it stronger as well. The "trunk" holding up the enormous flower was longer than before evolution. Four huge, banana-like leaves still grew from its base, but unlike before, they extended diagonally forward-left, forward-right, backward-left, and backward-right. Another ring of four green leaves had also grown, lighter in color than those at the base and supported by slender brown structures resembling coconut palm trunks. Four vines hung from the central "trunk," their other ends attached to the bases of the surrounding leaves. The flower's center had fewer points,