Poison/Burn animation with 0 HP glitch
The Poison/Burn animation with 0 HP glitch is a natural glitch in Pokémon Red, Green, Blue, and Yellow.
If a poisoned/burned Pokémon with few HP it's confused and in the next turn lose his HP, his HP will be 0, but before he faints, the message and the animation of the poison/burn will appear, although the Pokémon doesn't have any HP. This also happen with a move which rest HP like Take Down.
This was fixed in Pokémon Gold and Silver.
Video demonstration
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