Generation IV hybrids are glitch Pokémon that share the sprites of normal Pokémon. Before the battle starts, the Pokémon's sprite jumps around the screen in a line going left to right and they hover above the ground. They crash the game when their undefined Pokédex entry is viewed (some emulators can view the entry, but all cartridge versions will crash at this point), when they attempt to use their currently unknown glitch move, and when the player attempts to view their stats screen. All hybrids have a common moveset. They do not exist in Generation V because improved error handling capabilities withdraw the pointer data for species identifier modulo 651. This is also a similar case with Pokémon Battle Revolution, where any Pokémon with species identifier greater than 495 (or with a species identifier of 0) is taken as (no Pokémon).