The main series of Pokémon games stretches across five generations and includes a huge number of games as well as 649 Pokémon for you to collect and battle. In parallel to the main games, there also exist a number of spin-off titles that take the Pokémon name and attempt to create a Pokémon experience that is simultaneously familiar, yet entirely different in format.
The main series of Pokémon games seem to have an appeal that none of the spin-offs can possibly match. This appeal is almost certainly down to the unchanging format that the game is based on that has us catching, training, and assembling a Pokémon team of our own choosing to see us through our wild battles, trainer encounters, gym fights, and the fight against the evils of the Pokémon world.
Pokémon is big business: the truth in this statement is reflected in the fact that the main series of Pokémon is currently on its fifth generation, with the sixth currently in production and due to become a reality later this year with the release of Pokémon X and Y. In between the main-series games, fans always have the opportunity to keep themselves occupied with some of the spin-offs whilst they wait for the next big game to arrive. The Pokémon Ranger series is a unique take on the Pokémon idea, and is arguably the best of all of the spin-offs of the main series. Pokémon Ranger: Guardian Signs is the latest in the Pokémon Ranger series that involve the capturing of Pokémon in a manner far removed from the main series of games; rescuing the Pokémon is the aim here, and eventually setting them free is the ultimate goal.