Monster Trainer - Raise and Battle Monsters
(I've attached the horizontal screenshots to this post so you don't have to turn your monitor sideways )
Summary: Raise, train, and battle your choice of Medusa, a witch, a werewolf, a zombie, or Zeus. Battle friends and strangers around the world using Game Center. As your monster grows and levels up, it evolves through three life stages and the app allows you to choose from several skills to make stronger to customize your monster for battle. The game has three training mini-games for gold and experience, computer battle, and most importantly, the ability to battle friends and strangers located anywhere in the world.
Please post which promo code you used if you download the app so the other community members know it is no longer valid. I hope you enjoy it!