Using a Super Glitch item and battle escape item to get Pokémon ("LOL glitch") Gen I
Read description for more information:
This trick, known as "LOL glitch" was found by luckytyphlosion when he was experimenting with glitch items.
It allows you to use screen data to get Pokémon. The tile that determines the Pokémon is the same as if you used CoolTrainer, so many CoolTrainer positions should work for LOL glitch.
Advantages:
1) Allows you to do 'CoolTrainer mutation' in Yellow to get more than just Missingno. and Horsea.
2) Sometimes CoolTrainer will just stop working, but this should always work unless the item's name is from memory (and I don't know if that's possible).
3) You don't have to go to a cave like in bad CoolTrainers.
Red/Blue steps:
1) Enter a wild Pokémon battle and escape the battle using 9F (hex:5E).
2) The graphics will be messed up. You may want to fix them by entering a warp and leaving, but don't fly away, as flying away will reset D057 back to 00.
3) Walk to a position where there is a 50 tile ''before'' x=08 y=0C. This is to avoid corruption of D057.
Advanced: This tile can be 01 (making step 1 and 2 unnecessary) and a 50 tile can be anywhere on the screen after x=08 y=0C, but if you do that and x=0B y=0C is not 00, you'll get a forced item selection effect, so in that case put 9F at the top of the list before you use the ball to get out of the menu. Additionally, if you have your first 50 at X=01 Y=10 or later and X=01 Y=10 is a non 00 value, you'll make menus and text invisible, but I think this is a hindrance.
4) Use a Super Glitch item, such as PC (hex:80) and then throw a ball to get your Pokémon!
Yellow steps:
1) Enter a wild Pokémon battle and escape using -gm (hex:6A) or Lg- (hex:6E). If you use -gm, it may seem like the game just softlocks, but all you have to do is open the start menu. If you use Lg-, you have to wait for a few seconds before the battle ends.
2) Recommended: Put the graphics back to normal with 9F (hex:5E)
3) Walk to a position where there is a 50 tile ''before'' x=08 y=0C. This is to avoid corruption of D057. Don't fly away, as flying away will reset D057 back to 00.
Advanced: This tile can be 01 (making step 1 and 2 unnecessary) and a 50 tile can be anywhere on the screen after x=08 y=0C, but if you do that and x=0B y=0C is not 00, you'll get a forced item selection effect, so in that case put 9F at the top of the list before you use the ball to get out of the menu. Additionally, if you have your first 50 at X=01 Y=10 or later and X=01 Y=10 is a non 00 value, you'll make menus and text invisible, but I think this is a hindrance.
4) Use a Super Glitch item, such as 2p (hex:92) and then throw a ball to get your Pokémon!
Notes:
1) You can get these items with this method for RBY (https://www.youtube.com/watch?v=98_azamLeh4).
2) Glitch Cities differ between Red/Blue and Yellow, making some methods to get particular species not to work.
3) Super Glitch items corrupt the memory because their name is copied from CD6D to CF4B up to (inclusive) 50. If there is no 50 in the first 20 characters, screen data gets copied to CF5F and onward.
4) Encountering a hooked Metapod (through instant encounter) is possible if the first 50 is after here http://i.minus.com/itiyRipQyWvC9.png (x=0A, y=0C), but you can't get anything other than Metapod because x=0A y=0C has to be part of the menu. The broken start menu effect cannot be used to work around this, but you can get different Pokémon in Japanese versions due to different screen tiles corrupting different things.
5) Known side effects: Corruption of what NPCs look like, corruption of wild Pokémon's HP and status, turning them into Ditto when you catch them. The corruption of wild Pokémon can be fixed by saving and resetting.
6) Save and reset (or encounter a wild Pokémon and run?) before doing the glitch again, or the Pokémon will be Ditto.
7) Even in places where you can Dig, if you do this glitch then you can't Dig. This is due to D057/6 being 01. You can fix this by saving and resetting.
This description was rushed because I've got to go somewhere today. I may improve it later.
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