PokéBase - Pokémon Q&A
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I have gotten Cubone and mew. What else is their?


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As the Pokémon that appears from the glitch is based on the Special stat of the Pokémon last battled, the player can easily manipulate which species appears by battling a different Trainer, or even by encountering wild Pokémon after the escape and Trainer battle but before the encounter. For example, the Lass at the top of the first floor of Mt. Moon has a level 11 Bellsprout with a Special stat of 22 last in her party, and so battling her last in the glitch will result in encountering a level 7 Gyarados, whose index number is 22.

Source: https://m.bulbapedia.bulbagarden.net/wiki/Mew_glitch
If you need more info comment on my answer.

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What is an index number?
>An index number is a number used internally by games to identify certain things. In the Pokémon games, there are index numbers for many things, most which are not seen other than by the programmers.
Source: https://m.bulbapedia.bulbagarden.net/wiki/Index_number
>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 the glitch 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.
Source: https://m.bulbapedia.bulbagarden.net/wiki/List_of_Pokémon_by_index_number_(Generation_I)