How to get Pokemon for iPhone?

My friend has Pokemon blue on his android phone and I'm wondering if it's possible to get it on iPhone 5? If not, does anyone know if a Pokemon app will be released?

There's no official Pokemon game on the Android or Apple market that I know of. Phones aren't usually powerful enough to use emulators. I'm guessing your friend jailbroke his Andriod.

But you CAN do it yourself without jailbreaking by going here:
http://inseven.co.uk/apps/gameplay/

Game Play is basically an emulator for your phone. There's an article on it here if you want to read about it.
http://archive.vg/blog/21-news/101-game-play-lets-you-play-game-boy-on-your-iphone-5-without-jailbreaking

There's no offical pokemon game for andriod or apple, but i'm betting your friend jailbroke his andriod (you get a ton of unoffical games for your phone/ipod when you jailbreak)

You would have to jailbreak your iPhone, in order to get the AppStore Cydia. Once you get that, search for an emulator compatible with the game. Download it, download the rom for the game, and play.