THE MUSIC! I think I can confidently say my favorite music in any pokemon game besides Legends Arceus which basically has these tracks in a more advanced state. It's such a toss up between Sinnoh and Unova for best region, but I think I would have to get Sinnoh the edge here. It's just such a joy to explore especially when you get into the ladder half of the game.

Team Galactic is a super fun antagonist and Cynthia is one of the best boss theme's and overall fight of all time. The pokemon in this region is probably the deepest the creators got in their bag with highlights like Luxray, Garchomp, Lucario, Gliscor, and all the Gen 1 third evo's.