>>429315951) Explorers of Sky: The gameplay is fun and more unpredictable than mainline games. Also, it has a nice story and post game
2) Crystal: It's /comfy/ as hell and has a modern pokemon game feel to it. I enjoy replaying through it.
3) B2W2: Took everything good about BW and made them better as well as adding more features. It has a nice variety of pokemon, plenty of places to explore, and has more than enough content to quench that thirst for post game content.