Satoshi and Butterfree! Until the Day We Meet Again!! - S16-E33
Continuity mistake: In one shot of Ash and his friends helping Caterpie, Caterpie's yellow tail turns green like the rest of its body. (00:10:12)
Satoshi and Butterfree! Until the Day We Meet Again!! - S16-E33
Revealing mistake: In the close-up of Ash and Metapod running to the cliff at night, part of Metapod is cut off several times. (00:15:12)
Answer: Yes it ran away because Layla hurt its feelings.