After conducting a search, I found a few resources that might be relevant to Sacred Gold, a pre-patched ROM:
All 493 Pokémon from the first four generations are obtainable within a single save file. sacred gold pre patched rom
Do not use Google search’s first result. Instead, visit: After conducting a search, I found a few
from Generations 1 through 4 are obtainable within a single playthrough without the need for trading Key Feature Highlights Increased Difficulty: After conducting a search
While "pre-patched" ROMs (files that already have modifications applied) are often found on various third-party sites, downloading them is generally considered illegal because they distribute copyrighted game data. The safest and most ethical way to play Pokémon Sacred Gold