The geography of a Pokemon game is very important. Each route, town, and city needs to have something special to make it stand out. Pokemon Black and White's Unova region had Castelia City, an urban area based on New York City. Yet Unova isn't my favourite. Here are my top three best Pokemon regions.
Pokemon Ruby and Sapphire were released for the Game Boy Advance in November 2003 (Europe). Set in the region of Hoenn, players have to fight Team Aqua or Team Magma whose goal it is to change to landscape of Hoenn. Team Aqua want more water throughout Hoenn, and Team Magma want more land.
Ruby and Sapphire were the first Pokemon games on the GBA and this more powerful handheld enabled Game Freak to create a much more detailed Pokemon region.
Hoenn has a very interesting landscape. A sizeable portion of the region is covered in water, which gives it a very different look to other regions in the main series. The most interesting places to live in Hoenn have to be Fortree City and Pacifidlog town. Fortree City is a place where people live in treetop houses, and Pacifidlog Town inhabitants live on an wooden plank island in the sea. When I ask people why they think Hoenn is so great, the reply is often how different the towns and cities are, especially Fortree City.
Pokemon Emerald was released a few years later and introduced the Battle Frontier. This was a brand new island that couldn't be found in Ruby and Sapphire. The Battle Frontier had several different battle challenges to participate in, each with different rules. BP gained can be used towards moves or special items.
There is still a lot of love for Generation 3. It feels like I see people saying 'remake Ruby and Sapphire' almost every day. Ruby, Sapphire, and Emerald had decent story lines and the environment reflected the story perfectly. Maybe some day they will be remade, but I feel Game Freak should be focusing on new games for 3DS after Pokemon Black and White 2 are released later this year.
Just like Hoenn, Sinnoh was also a setting for a new generation of Pokemon on a new Nintendo handheld. This time it was Pokemon Diamond and Pearl on DS and the technological advancements of DS once again led to more diversity in the Pokemon world.
The land of Sinnoh is somewhat spilt in two as you have the huge Mt. Coronet in the middle. It is believed that is is the biggest mountain in all of the Pokemon games.
To the north-east of the region there is an island where you can find the Fight Area. Here you can access an improved Battle Frontier similar to the one that was in Hoenn. My personal favourite part of this island is the Resort Area. As an exclusive feature to Pokemon Platinum you are given your very own luxury villa! Admittedly it's purely cosmetic, but there are plots for berries outside and you can buy items to decorate it.
What makes Sinnoh so great is beneath the surface. In Diamond, Pearl, and Platinum you are able to use an item called the Explorer Kit to visit The Underground. In The Underground you were able to make a secret base and decorate it. You could also dig for rare items like fossils and evolution items. I think I spent more time underground in Sinnoh then over ground!