I have hunted through the internet and found out that there is atleast 13 different types of glitch pokemon (chances are there are more) in the pokemon blue game. I will write down each pokemons name and what i know about them. If you know of anymore glitch pokemon please tell me and il check them out...

MissingNo. - Is the most famous and common glitch pokemon on the game. MissingNo is a bird/ Normal pokemon and is seen in the form of a fuzzy looking upsidown L shape. It has also been know to make you pokemon hall of fame go crazy or even make you game crash.

'M - 'M is exactly the same and MissingNo other than a different name and is not available on pokemon yellow.

a - a is a water type glitch pokemon and is also know for freezing your game when caught so if you are going to try and get this make sure you save your game before trying to catch it. It is thought to be a glitch of poliwhirl as it will apear and No.61 on your pokedex and is seen as a water pokemon.

A - A is a Normal type pokemon and is seen as a small fuzzy rectangle. The glitch pokemon is %100 certain not to freeze you game in anyway.

LM4 - LM4 is a water/ fighting glitch pokemon and is know to be a hybrid of poliwrath. When you reach level 11 with this pokemon it will either evolve into a clefairy or nidoking.

h POKé - h POKé is a ghost/ poison pokemon and is very hard to catch and train as the chances are it will lock up before you get the chance to catch it. h POKé
has the longest cry out of any pokemon and sounds very glitched.

Chiisai-u - Chiisai-u is a normal/ ground pokemon and can only be caught by using a glitch and gameshark cheats at the same time. This pokemon will freeze your game when sent into battle and evolves into a spearow at level 9.

PokéWTrainer - is a ground/ normal pokemon and will cause your game to freeze when seen. It will also evolve into another glitch pokemon when traded to yellow.

p T - is a ground/ normal pokemon and has little know about it as your game is %100 certain to freeze when caught.

.4 - is seen as a small dot on the screen and its cry is the same sound as a pokeball when catching a pokemon. It is also the only pokemon with no weakness's

PkMn - is exactly the same as A but starts out with different moves.

Charizard'M - is identical to missingno but evolves to kangaskhan at level 1.

Mew - Mew is not a glitch pokemon but is found in the game by using the mew glitch, so therefore could be classed and a glitch pokemon if it is caught in that way.

If you have any questions about any of these please ask and i will try my best to give you as much info as possible.

Just to add i have tried these out and they all work.

quote theboywithnoface

Chiisai-u - Chiisai-u is a normal/ ground pokemon and can only be caught by using a glitch and gameshark cheats at the same time. This pokemon will freeze your game when sent into battle and evolves into a spearow at level 9.

And how do they know that it evolves into spearow at level 9 if it freezes the game when going into battle

well i used rare candys and it worked

Hmm...rare candys. Didn't think of that one. My bad