Red/Blue: A strange seed was planted on its back at birth. Thus, a plant sprouted and now grows with this Pokemon.
Gold/Silver: The seed on its back is filled with nutrients. The seed grows steadily larger as its body grows.
It carries a seed on its back right from birth. As it grows older, the seed also grows larger.

While it is young, it uses the nutrients that are stored in the seeds on its back in order to grow.

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