Bulbasaur

“A strange seed was planted on its back at birth. The plant sprouts and grows with this POKéMON.”

— Pokémon Red

“It can go for days without eating a single morsel. In the bulb on its back, it stores energy.”

— Pokémon Yellow

“The seed on its back is filled with nutrients. The seed grows steadily larger as its body grows.”

— Pokémon Gold