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Invisible Shiny Bulbasaur is a glitch Pokémon in Pokémon Diamond and Pearl.
It is usually found in Sinnoh's Oreburgh Mine with the use of an Action Replay. It can also be encountered in a wild double battle when using a cheat code to walk over water, and it can be found in Victory Road as well.
Invisible Shiny Bulbasaur always appears at Lv.0 with 0 Max HP, similarly to ?????????? in Generation III. It doesn't appear to have any usable attacks -- in double battles, the only attack it can use is Struggle. It is apparently invisible, although it may have a sprite resembling DPBox's (when it uses Struggle in a double battle, the bottom of a sprite resembling DPBox's is visible at the top of the screen); it sparkles like a Shiny Pokémon when it appears; and it's cry is the same as that of a Bulbasaur. If the player attempts to attack it, the game will assume there is no target and end the battle immediately.
By using the walk through walls code to walk over water, the player can trigger a wild double battle with an Invisible Shiny Bulbasaur and a real Pokémon. The game, thinking that the player is traveling with a partner, will display two of the player's back sprite, one being the player and the "clone" being the non-existant partner. The partner, whose name is nothing more than a blank space, will send out a DP Box. If the player does not run, then after both real Pokémon have taken their turns, one of the glitches will attack the other with Struggle, causing both to faint (one from damage, the other from recoil).
Interestingly, in a wild double battle, Invisible Shiny Bulbasaur copies its partner's Speed stat and replaces all participating Pokemon's cries (including DPBox) with a Bulbasaur's cry. After each attack animation, its HP counter disappears.
Video of an encounter with this glitch