WikiDex is a wiki (a collaborative online database) that documents information about various Pokémon games, including fan-made ones like Pokémon Unbound. The "UPD" likely refers to updates or recent changes made to the game's information on WikiDex.
Pokémon Unbound es un aclamado hack de ROM para Game Boy Advance basado en pokemon unbound espanol wikidex upd
I understand you're looking for an for the ROM hack Pokémon Unbound . WikiDex is a wiki (a collaborative online database)