https://www.youtube.com/watch?v=uhrMtk8ifuoIt kinda writes itself! Porygon2, if I remember correctly, learn emotions on their own after evolving from emotionless Porygon. I can imagine a trainer having a tough time trying to instill some feeling in their newly evolved Porygon2. They're eager to have their friend experience the world fully,going on adventure after adventure only for the Porygon2 to stare blankly into space the entire time.
Eventually, the trainer goes to an amusement park. The day goes on, and the Porygon2 shows no response to the multiple snacks, rides, and shows that they visit. At sunset, the trainer sits near the oceanside, saddened. It's beginning to get a bit chilly.
The Porygon2 nudges him and cuddles up for warmth.