Sun's great-grandfather is a character appearing in Pokémon Adventures manga.
Sun & Moon
Through a video call, Sun wanted to see his grandfather's Meowth but they didn't listen to him. His grandfather then apologized for their behaviour but Sun was still excited that he had seen them. His grandfather then mentioned that these Meowth weren't the ones that Sun can see in his region and that they were raised by a rich family, explaining their behaviour.
Meowth (multiple) *