>>43228861Because at the time, despite how Pokemon always jacked off how Pokemon are such great friends and companion, there was very little interactivity between you and your Pokemon besides training them or doing contests in the games.
Walking Pokemon was sort of revolutionary for that, because it let players feel closer to their Pokemon and the feeling of the Pokemom world. It's a small addition, compared to ones like Amie or Camp, but it was a great one for what it was.
But even now with Amie, Camp, and Go's Buddy system, Pokemon interactivity still feels pretty fucking limited.