v1.05 includes features that many official games would only adopt years later:
Note: This guide is written for Version 1.05, which fixes several bugs present in earlier versions (like the Ruins of Alph crash) and adjusts the level curve and Pokémon rosters. Pokemon Sacred Gold -v1.05-
Here are a few final tips and tricks to help you get the most out of Pokémon Sacred Gold -v1.05-: many Pokémon were locked behind trades
In the original HeartGold, many Pokémon were locked behind trades, version exclusives, or post-game areas. Sacred Gold fixes this by making all 493 Pokémon (up to Generation IV) obtainable within a single save file. Pokemon Sacred Gold -v1.05-