It is found in the Yellow version only. It occupies Hex D3(see [1]). If traded to the Red/Blue, it will become a M p'u ゥ. It can only be obtained by the Johto guard glitch with Pichu. Its data entry, weight and height are the same as Dragonair's. The only differences are the picture and the fact that its species appears as RAGON instead of DRAGON. Just like .8 and 4. .
This glitch Pokémon article is part of Project GlitchDex, a Bulbapedia project that aims to write comprehensive articles on glitches in the Pokémon games.