Gen 5 is my favorite because the game adds character customization. Being able to play yourself in the Pokémon world makes it that much more immersive.

Gen 4 is a close second because splitting move types into physical and special according to the kind of attack (Ice Punch vs Ice Beam) instead of the type of attack (Fighting vs Water) changed the meta in a good way.

If you want to try one of the newer games, I recommend X and Y. Trainer customization is very good and the difficulty is up to you by turning the Experience Share on and off. It's for 3DS and you can usually find it used anywhere.

The yellow team leader was talking about Pokémon power being related to hatching eggs and I figured that meant in the future, #TeamInstinct would get some kind of egg hatching bonus (and the other teams got different bonuses as well).