As a Pokémon available for use at Professor Oak's lab[]
Bulbasaur was available as a starter Pokemon at Professor Oak's Lab. He was offered to Clarissa and Selena however Clarissa chose Charmander and Selena chose Squirtle (whom she later rejected and it was obtained by Mason). Although Bulbasaur was upset at not being pick, Professor Oak gave him to Katrina.
During this series Bulbasaur evolved into Venusaur when trying to save Katrina from falling into the abyss of The Distortion World but failed. After this he was cold towards Mason.
As a Bulbasaur he was very affection and loyal towards Katrina. However after he evolved into Venusaur, he began to disobey his trainer. This was due to what happened to Katrina during the Unova Saga. After seeing Katrina being overtaken by the DNA Splicers, causing her to go rouge, Venusaur felt as if he was betrayed his trainer. Katrina later regained his trust after showing that the DNA Splicers were no longer affecting her with the help of Jax. When Katrina began to become close to Jax's Pichu, Venusaur was shown to be jealous thinking Pichu was "taking her away".
Overtime Bulbasaur as matured greatly instead of acting nervous and scared everywhere. Venusaur carried on these characteristics and became more respected by larger Pokémon.
