Generation I
The Generation 1, was known as The Colour Generation, or The Chromatic Generation due to the name of the game titles. The games of this generation are Pokemon Red, Pokemon Green, Pokemon Blue and the SpecialEdition Pokemon Yellow, all of them being developed in 1990. In Generation 1 was intruduced the Kanto Region, where all the action takes place, with 151 Pokemons including Mew and Mewtwo, the Legendary Pokemon.
GYM Leaders
In each Pokémon game of Generation I, all Pokémon have an unseen index number used to identify them in the game's ROM. Unlike later generations, the Pokémon are far from being in order by their National Pokédex numbers, and most evolution families are extremely fragmented. In addition, 39 copies of theglitch Pokémon Missingno. permeate the list, causing the last non-glitch Pokémon, Victreebel, to be located at index 190 instead of the expected 151. Index 0 and indices from 191 to 255 (hex 0xFF) contain all other glitch Pokémon in Generation I. Since Rhydon is located at index 1, many glitch Pokémon will become it upon capture and viewing of their glitched Pokédex entry, known as the Rhydon glitch.
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