Pokémon Red and Blue Versions/Features/Pokémon

Each game contains pre-recorded data on 151 different species of Pokémon, including, 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.