updated 01:25 pm EST, Mon February 20, 2012
Resembles authentic app
Shoppers on the App Store are complaining of a scam Pokémon app, Pokémon Yellow. Title makes some pretenses of being authentic Pokémon game, for instance by using an official-looking icon, and claiming to have "original sounds, features, Pokémon and characters." A quick look shows inconsistencies though, such as an unknown developer, anonymous five-star reviews, and a statement that "All trademarks and copyrights are owned by their respective owners."
More seriously the app appears to be non-functional at a cost of $1 per download. Despite being on the App Store since February 17th, Apple has yet to pull the title. The official Pokémon games are published by Nintendo, which prefers to support its own gaming platforms like the 3DS and the Wii.