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By SKyTheThunder
#217773 Enchanted Books for Mending, Efficiency, Unbreaking, Fortune and Silk Touch (all at max level) can be obtained from Fishing with Pixelmon Rods, on top of their Vanilla loot and Fishing sources.

Not sure how much sense it would make to have them as drops from Pokémon. Possibly as rare drops from thematically fitting evolved Pokémon like Mismagius or Delphox maybe? But even there I'm not sure.
I could see them getting added to some of the rarer Chest Loot Tables like Haunted Towers or the Christmas Village though.