After you took three of alola pokemon, you've returned to your house with them, many years have passed, one day you came outside to check, you see decidueye just sitting, looking up the sky, incineroar training like a madman, and primarina singing softly while slightly dancing because why not

Primarina: Singing

Decidueye: Watches, rolling his eyes out of boredom

Incineroar: Training, showing off how big and strong he is