I've caught some shiny pokemon in beast balls (eevee, rattata, yungoos, abra, makuhita, and mudbray). But my favorite beast ball pokemon was a "full odds" random bonsly. I put quotes because of the higher shiny rate from gen 6 and onwards. I was walking around, trying to finish my dex, when I found a shiny bonsly. I was really lucky because that was the last pokemon I needed from akala island.
Also, congrats on your 300th post
Also, congrats on your 300th post