Substitute ¼ HP glitch
The Substitute ¼ HP glitch is a natural glitch in Pokémon Red, Blue, and Yellow.
If a Pokémon uses Substitute on exactly 1/4 of its HP, it will faint as soon as the Substitute appears, instead of the player receiving the "Too weak to make a SUBSTITUTE!" message. This behaviour was changed in Pokémon Stadium so that a Pokémon can't use Substitute on exactly 1/4 of its HP.
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Attribution
- ChickasaurusGL (article text, video)