As much as I love 3rd Gen Kanto, I have to go with Hoenn, more specifically Emerald's Hoenn. I absolutely LOVE the tropical region, and all of the different terrain in it. I especially love Fortree City, with it's mix of human living and nature. With the Battle Frontier, Trainer Hill, Contests, Battle Tents, Safari Zone Expansion, and Mini-Game House, it's got a LOT to do. Not to mention how it handles Secret Bases, and makes them a part of the world.
Someone with a passion for video games, writing, and reading. Remember, every story has a purpose, even if it's hard to find. That's what makes the adventure so exciting.
I use what I like, and play by the Worlds rules (meaning OHKO, Evasion, et alia. are allowed). I don't care about EVs or IVs, or the community-based competitive rules and metagame. Take that as you will.