WARNING: DO NOT TEST THIS IN YOUR OWN GAME, OR AT LEAST MAKE A BACK-UP SAVE. YOUR SAVE FILE WILL MOST LIKELY GET CORRUPTED.
I have found a new glitch Pokemon that is not on bulbapedia. What I did was use the Pokemon Modifier code (The one in Platinum for the calculator) and typed in 999. No, this is not the white block.
It's a black box. When you encounter it, it's level varies depending on the area and is not shiny. It has a very long animation that shows it bouncing, then it swivels to the left and right a little. When you are finally able to battle, pixels are removed from the black box.
If you try to capture it, it adds the data to the Pokedex, and then freezes.
Using Ditto and using Transform while battling the glitch causes the game to crash. It crashes again if you try to encounter it again.
It's cry is Bulbasaur's cry
If you try to catch it,it will most likely break free. When it does, it causes your Pokemon to become a black box as well.
When you leave the battle and go to anything in the menu screen with text on it, the text will be garbled, or turn into numbers.
Type: Water/Grass (Tested numerous types on it.)
So far, it knows:
On top of all this, it has a very low catch rate. If you knock it's HP down, well, it's going to die from having 1 HP. It has EXP, Attack, and Special Attack.
Here is a video of the "failed capturing" glitch, Black box using Present, and the text glitch.
I will be editing this page frequently, stay tuned for more information!