Blaine Super Potion glitch
The Blaine Super Potion glitch is a natural glitch which occurs in Pokémon Red and Blue.
Blaine is able to use a Super Potion on one of his Pokémon even if it has full HP. This is unlike other Trainers who may randomly use a healing items only if the HP is not full and it is below a certain ratio.
It appears that the HP of Blaine's Pokémon cannot be raised above the maximum. Addresses CFE6, CFE7 (enemy's HP) are not affected after Blaine uses a Super Potion on Growlithe with full HP.
This oversight may have been fixed in (at least the English version of) Pokémon Yellow, where it appears to be impossible to have Blaine use a Super Potion on a Pokémon with full HP.
Explanation
In Red and Blue, different Trainer types have different AI, detailed in this Pokémon Speedruns wiki article.
For some reason, Blaine is able to use a Super Potion on one of his Pokémon even if it has full HP. This is unlike other Trainers who may randomly use a healing items only if the HP is not full and it is below a certain ratio.
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