Pokemon Emerald is infamous for trade evolutions. To get a Gengar, Alakazam, or Golem, you needed a Link Cable and a friend. For solo players today, obtaining these Pokemon legitimately is nearly impossible without expensive hardware. A save file with "All Pokemon" includes these fully evolved forms, bypassing the hardware restrictions of the past.
National Dex complete, all Battle Frontier trophies, and legit event Pokémon. .sav / .sgm Pokemon Emerald Save File All Pokemon