"Pokémon Fire Red 1636" is not a monster to catch or a cheat code to enter. It is a —a fingerprint left by the game's developers indicating where they assumed the player would never tread. In the years since its discovery, the 1636 exploit has been patched out of romhacks, banned from most leaderboards (except "Glitch Any%" categories), and studied as a case study in memory safety for embedded systems.
If you are looking to replay the classic Kanto region experience, you are likely looking for the ROM. pokemon fire red 1636
For those deep into the emulation or ROM hacking scene, the number is iconic. It refers to the specific file header for the USA version of Pokémon FireRed Version (Rev 1) . "Pokémon Fire Red 1636" is not a monster