Andy's Venusaur

Andy's Venusaur is a Pokemon Andy obtained while he was in Kanto.

Kanto Arc
It first appeared in Pallet Town as a Bulbasuar. It was going to be given to a new trainer, but Andy was challenged by Silver to a Pokemon battle, he borrowed all three of Professor Oak's starters and Pikachu. When Professor Oak allowed Andy to chose a starter, he chose Pikachu because it helped him beat Silver, much to Bulbasuar's disappointment. So it decided to leave Professor Oak's Lab to follow Andy, when Andy arrived in Viridian Forrest Bulbasuar helped Andy capture a Rattata.