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The first generation (generation I) of the Pokémon franchise features the original 151 fictional species of monsters introduced to the core video game series in the 1996 Game Boy games Pocket Monsters Red, Green and Blue (known as Pokémon Red, Green and Blue outside of Japan). Later, Pokémon Yellow and Blue were released in Japan. The following list details the 151 Pokémon of generation I in order of their National Pokédex number. The first Pokémon, Bulbasaur, is number 0001 and the last, Mew, is number 0151. Alternate forms that result in type changes are included for convenience. Mega evolutions and regional forms are included on the pages for the generation in which they were introduced. MissingNo., a glitch, is also on this list.