Ivysaur

Biology
Ivysaur carries a bulb on its back which draws energy from its body. If the bulb gives a nice smell, it means Ivysaur is almost ready to evolve into Venusaur.

Behaviour
When Bulbasaur feels sick or needs energy, it uses the sunlight through the bulb on its back to heal or gain energy.

Pokédex Entries

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Bill's Ivysaur

 * Main Article: Bill Turing → Pokémon

Bill reveals in that he owns an Ivysaur that companies him. He uses the Pokémon to stop Porygon from coming from the virtual reality, later for protection. However, Ivysaur fails to accomplish any of it.