The most legitimate way is to trade with friends, use the wireless adapter for trades, or catch as many as you can.
To catch all 386 in Emerald legitimately requires: pokemon emerald all pokemon save file new
So "all 386" in Emerald cannot be done 100% legit without external cheating/event distribution cartridges. The most legitimate way is to trade with
For nearly two decades, Pokemon Emerald has stood as a gold standard in the franchise. Released in 2005 for the Game Boy Advance, it refined the Hoenn region with the addition of the Battle Frontier, dynamic gym leader rematches, and the iconic race against both Team Magma and Team Aqua. Yet, for all its glory, one goal has remained tantalizingly out of reach for even the most dedicated players: completing the National Pokedex. So "all 386" in Emerald cannot be done
To catch ’em all in Emerald is a Herculean task. It requires trading with Ruby, Sapphire, FireRed, LeafGreen, and even Colosseum on the GameCube. This is where the demand for a "Pokemon Emerald all pokemon save file new" comes into play. This article explores what that search means, where to find such a file, how to install it, and why starting a "new" game with a complete collection might be the best way to re-experience Hoenn.
Emerald was notorious for requiring real-world events to catch certain mythical Pokemon. A truly "complete" new save file must include: