“Legend had it there was a specially modded version of Pokemon Red/Blue, called Pokemon Black (Before Black was ever announced) – and it’s creepy as hell. The game begins very much as Red/Blue did, with one exception – in addition to your chosen starter Pokemon, you have another Pokemon, caled “Ghost” – and you cannot remove it from your party. It’s represented by the unidentified Ghost sprite you see before obtaining the Silph Scope, and it knows one move, called “Curse” (although – not the same “Curse” move present in later generations of Pokemon). And when you use Curse on wild Pokemon, the screen will simply go to black and you would hear a low-pitched cry. When the battle screen came back, the opposing Pokemon was gone. When used against a trainer’s Pokemon, they would be left with one less Pokeball.
What was happening was you were actually killing Pokemon. And it gets worse.
If you used Curse once all the trainer’s Pokemon were gone, the overworld trainer sprite would be gone, replaced with a tombstone. Yikes.”