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P7 (hex:5D) is a glitch item in the Spanish versions of Pokémon Red and Blue with index number 93. Its behavior is very similar to that of 8F in the English versions of Red and Blue.
Its effect pointer is D163 in WRAM, which is the beginning of the party Pokemon data in memory. Since this is relatively easy to manipulate, P7 is popular for arbitrary code execution.
The setup for bootstrapping is almost exactly the same as that of 8F, except that due to differences in the memory layout,the third item slot is at $D327 instead of $D322. To fix this, the Onix in any 8F bootstrap is usually replaced with a Graveler.