No stone evolves swadloon. It evolves on level 32
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Swadloon evolves by happiness.
Sewaddle evolves at level 20 into Swadloon.
Sewaddle evolves into Swadloon at level 20. From there, it can evolve into Leavanny with max happiness.
nbd sewaddle evolves to swadloon at lvl 20 and then to leavanny with happiness
There isn't a stone that evolves it. It evolves naturally at lvl 28 into a Primape.