nothing.
Furret itself is an evolution. Sentret evolves into Furret at level 15.
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No. Furret evolves from Sentret. It does not have an evolved form after it.
At the beginning of the game you can get a sentret and evolve it into Furret.
Sentret evolves into Furret at lv. 15
Sentret evolves into Furret at level 15.
Sentret evolves at level 15. Then it will turn into Furret.