ZZAZZ glitch
The ZZAZZ glitch is a glitch found in the Generation I games. It is encountered by using the Mew glitch that has a decimal number of 251, 252, 254 or 255. This makes the player encounter a glitch Trainer that in turn allows this glitch to occur. Attempting to attack this trainer will cause the game to crash, but the player can escape by using an item.
One trait of this glitch is that it causes one of the opponent's Pokémon, usually a Charizard 'M, to have an extremely high amount HP. This is also a side-effect of using Super Glitch.
A side effect of ZZAZZ causes the trainer's name to become replaced with one that is much longer, composed mostly of A's and Z's. It also causes the Pokémon in the player's party to become glitchy as well, in addition to the player's sprite. Additionally, it makes three of the Pokémon's moves Explosion. Another known effect is that some or all of the player's Pokémon turn into Bulbasaur. A possible explanation to this is that the glitch overwrites certain variables with the hex value 99, since the hex value equals to 'Z' as a character, Explosion as a move and Bulbasaur as a Pokémon.
Although the player's name will glitch, the OT values of the party Pokémon will stay the same, tricking the game into thinking that they are not the player's. The combination of this, and the Pokémon's levels being at 153, causes them to disobey the trainer (as not even the Earth Badge is programmed to make Pokémon over level 100 obey the player.) On top of this, checking the Pokémon menu will usually cause the game to freeze.
Any Trainer battle fought during the glitch will become a battle against a glitch trainer with the player's sprite. He will either borrow the player's original name, their ZZAZZ-glitched name, or sometimes a different glitched name. His party will consist mainly of Charizard 'Ms, and he is unbeatable, because at some point he will send out a Charizard 'M that has a glitched HP bar that can never be depleted.
The abnormalities listed above occur in Pokémon Red and Blue; the Yellow Version abnormalities which occur are different.
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