Aside from one dream episode, no. Gladion's Silvally technically devolved when Faba reverted it into Type: Null, but we didn't see that happen, and it was a pretty unique case anyway.
I wonder if those Eggs will be the characters obtaining new Pokémon or their Pokémon reverting to Eggs due to Dialga and Palkia. We see Pikachu having reverted to Pichu in a couple of shots.
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