the 74th episode of black and white BW074
OR 731st of the whole anime
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the episode that ashs grovyle evolves is odd Pokemon out that's the name of the episode and the season is battle frontier
Swadloon evolves by happiness.
it evoves when it becomes a level 32
Level it up with its happiness value at 220
Sewaddle evolves at level 20 into Swadloon.