4( h 4 ? (ED)'s in the Pokédex. Its Pokédex number falls in the range of total items changing glitch Pokémon.
Total items changing glitch Pokémon are glitch Pokémon in Generation I that may alter the number of items in the player's bag upon encounter.
This effect is caused by the glitch Pokémon having a Pokédex number between 153-160. This causes the game to interpret a bit of D31D (Red/Blue)/D31C (Yellow) (number of bag items) as the Pokémon's encounter flag.
There is only one total items changing glitch Pokémon in English Pokémon Red, Blue, Yellow. This is 4( h 4 ? (ED), which may add +64 to the number of items in the bag upon encounter or capture. However, 4( h 4 ? (ED) has a volatile sprite that may freeze the game, and it also cannot be captured due to its experience group 0xFF, which causes the experience division by 0 glitch.
One known stable total items changing glitch Pokémon can be found in another language of Pokémon Red, Green, Blue, and Yellow. This is ヂィﾞィﾞゃいﾞ(hex:ED), which is possible to encounter without freezing the game.