You've finally been granted your Pokémon Trainer's license. Now, it's time to head out to become the world's greatest Pokémon Trainer. It's going to take all you've got to collect 150 Pokémon in this enormous world. Catch and train monsters like the shockingly-cute Pikachu. Face off against Blastoise's torrential water cannons. Stand strong when facing Pidgeot's stormy Gust. Trade with friends and watch your Pokémon evolve. Important—no single Pokémon can win at all. Can you develop the ultimate Pokémon strategy to defeat the eight Gym Leaders and become the greatest Pokémon Master of all time?
Each game contains pre-recorded data on 151 different species of Pokémon, including Mew, a Pokémon unavailable to players of either game under normal conditions. Despite this, not all Pokémon are available to the player, regardless of version; trades must occur between players in order to complete their Pokédex without the use of cheats or glitches. Mew is the only Pokémon in these games that must be acquired through attending either a Nintendo sponsored event, a glitch, or cheating.