I think that ORAS is the most SOULFUL Pokemon game. Why? Because it has the Top 3 most soulful features in the series.

1. Turn your Secret Base into your very own Pokemon Gym
2. DexNav
3. Soaring in the sky on Mega Latios

It really doesn't get more soulful than that. And there's so much more content available, like Battle Maison, Contest Spectaculars, Diving underwear, Trainer's Eye, Battle Institute, Mauville Food Court, Pokemon League rematches, Pokemon Amie, Super Training, etc.

It's funny how I used to hate on ORAS for years, but after replaying the game recently, it is now one of my favorite Pokemon games.