Glitch

This article is a summary page for different variations of a glitches, etc. when talked about as a whole.

Bulbapedia also has an article about Glitch.

Wikipedia also has an article about Glitch.

Glitch when used as noun refers to something happening or appearing in a program when it was not the developer's intention for it to work that way, be accessed that way, or be in the program itself. The effects of glitches vary, from simple graphical glitches to strange Pokémon, attacks, or items that were never intended to appear in the game. Glitches may be harmful or harmless to a player's save file.

In the Pokémon community, players often use the term glitch to describe several aspects of the game which are not actually glitches in the technical sense but rather as a placeholder, error handler or beta element, such as the name and sprite of the typical 00 variation of the glitch Pokémon ??????????, however the moves and base stats of these Pokémon can define them as glitch Pokémon as such details were never intended by the game developers.

As a verb

To glitch, the verb, is a common slang term in the Pokémon glitch community that simply means to change something in a game to what it should not normally be. This usually happens after a glitch is done, creating the term. Conjugation for to glitch is that of all regular English verbs.

As an adjective

The form "glitched" or "glitchy" may also be an adjective describing the state of a game after a glitching, or of a specific Pokémon or item affected by said glitching. A common example is a "glitched Hall of Fame" in Red/Blue versions, created after an encounter with MissingNo., or a "glitched Kangaskhan" created through evolving the glitch Pokémon 'M.