The mythical tale of Pokémon Black may be an urban legend, but it's great reading regardless. It's even better when you read it on a DS with accompanying graphics and sound.
Multiple: Option have made a "storybook" version of the tale, a visual novel that provides the text of the story with graphics on the DS' top screen, along with an apparent extended ending.
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Being a custom piece of software for a DS, you'll need a flash device like an R4 to read it (the devs say it's a "bit flaky" running via an emulator), but if you do, you should give it a try, scare some small kids with it.
Super creepy Pokémon hack turned into a homebrew visual novel for DS → [Tiny Cartridge]