LM4

LM4 or ゥL ||ゥM 4 (Japanese Name:アガ Aga) is a Glitch Pokémon that only appears in the Red and Blue games. Unlike most other Glitch Pokémon, LM4 will evolve. When it hits level 18, it will evolve into a Clefairy and then immediately into a Nidoking, unless either of these evolutions are cancelled.

Sharing the same number as Poliwrath, LM4 has the same Base Stats, type combination, and learnable moves. LM4 is also similar to Pokémon Yellow's 7g Glitch Pokémon, though 7g will not evolve.

Appearance
LM4 appears as a very large, square image, filled with scrambled bits of data as most glitch Pokémon are. Its colouring is blue, black and white, this may be because it shares Poliwrath's Pokédex number and in turn shares similar bits of Poliwrath's sprite and colouring.

Effects
LM4's glitch effects are limited and generally do no severe damage, this has led it to be one of the safer glitch pokémon to catch and train.

It still does, however, some strange glitches. One of them is rather common, when you catch LM4 it will scramble your Hall of Fame, just like MissingNo..

Another glitch (besides the other two evolutions) is its third evolution. When you teach it its Lv. 56 attack, it will evolve into an Abra or a Kangaskhan multiple times (around four) and then the game freezes. This does not happen with the other evolutions though and can be avoided by simply not teaching its Lv. 56 move.

Another glitch move is its attack that can be learned at Lv. 71. This attack's name appears as the word ALL followed by the name of your second slot Pokémon. This attack scrambles the visuals in some areas but has no serious effect.
 * (Example: 2nd slot Pokémon is a Charizard = Move Name:ALLCharizard)

Lastly, LM4's cry is a slowed down version of a song on one of the routes. Its cry will not loop like a real song but instead cuts out.

Location
LM4 is only obtainable when performing the third method out of three, in the Mew Glitch by having a Pokémon with a Special stat of 198.

Trivia

 * LM4 is considered one of the safer Glitch Pokémon to own, this is because any damage it does to saved data is minimal.
 * Some people refer to LM4 as Lord Moon the 4th. This name, however, never appears and is only a nickname of its nickname.