Yes! You can download apps from the OS app store on your iPhone!
The iwatch does have games that you can play. This watch can do just about anything a phone can do besides call someone.
NO but if you use bootcamp you can play it on Vista/ XP, or you can use Crossover games
You download it via the App Store. the App Store application is already on the iPhone
you need to get the feel for the game to actually know what is going on. but i guess you can watch the game play rather than play it yourself. its a free country.
Currently there is no official application that allows you to use your ipod device in order to play pokemon series games. However, by means of "jailbreaking" your ipod, it is possible to download programs from sources (such as "cydia") in order to play such games on your apple device.