FusionDex

Sunyte are less adept at swimming than Omanyte because the inside of its shell is full of soil and greenery instead of air. When the greenery becomes so abundant that it splits the shell open, Sunyte will be close to evolving.

One of the ancient and long-since-extinct Pokémon that have been regenerated from fossils by humans. Sunyte try to minimize movement to conserve the nutrients they have stored in their bodies for evolution.