As a horticulturist with a passion for botany, I can tell you that there's no such thing as a "mega venusaur" in the real world. However, in the realm of Pokémon, a popular franchise of video games, trading card games, and animated series, a "Mega Venusaur" refers to an enhanced, more powerful version of the Pokémon character Venusaur, which is a Grass/Poison-type Pokémon.

In the context of the Pokémon games, a Mega Evolution is a temporary, powerful transformation that certain Pokémon can undergo during battle. When a Venusaur Mega Evolves, it becomes Mega Venusaur, gaining increased stats, a new appearance, and sometimes even new abilities or moves. Mega Venusaur specifically has the ability Thick Fat, which halves the damage it takes from Fire- and Ice-type attacks.

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Mega Venusaur is the Mega Evolved form of Venusaur, evolving via Mega Evolution. It Mega Evolves during battle while its Mega Stone is held, along with whatever triggers Mega Evolution. The Mega Stone used to Mega Evolve Venusaur is currently unknown.read more >>