Development preview
Make Platinum Emerald
Make it from your four games, or update the Platinum Emerald you already have. Nothing is uploaded: your files are read by this page and stay in your browser. (The one exception: if the page cannot use a file you choose, it offers a button to send that file to us, and sends it only if you press it.) The game is in English.
Make Platinum Emerald from your four games
Choose your four game files, in any order. The page checks each one, makes Platinum Emerald on your computer and gives you platinum_emerald.gba.
1Your Emerald ROM
Pokemon Emerald Version (USA, Europe), a .gba file (or a .zip with it inside).
or drop it here2Your FireRed ROM
Pokemon FireRed Version (USA), a .gba file (or a .zip with it inside).
or drop it here3Your Platinum ROM
Pokemon Platinum Version (USA), a .nds file (or a .zip with it inside).
or drop it here4Your SoulSilver ROM
Pokemon SoulSilver Version (USA, Australia), a .nds file (or a .zip with it inside).
or drop it here5Make your .gba
One 32 MB file for flash carts, a real Game Boy Advance or GBA SP, and GBA emulators on a computer or a phone.
Choose your four files first.
Starting
Keep this tab open until it is done.
Playing it
The player guide lists the wild Pokemon, items and shops of every place in the four regions, how trade evolutions work, and where the legendaries are.
Updating: your save carries over to every new version. Save in the game before you update: emulator save states do not carry over. A save from a newer version will not load on an older one. To update, choose Update your Platinum Emerald to the latest version at the top of this page. Moving a save from mGBA to Delta or a phone app? The save tool trims mGBA's clock data so the save loads there. See what changed in each version.
Found a bug? Tell us on the bug report page. You can attach a screenshot, a video or your save file.
What this page downloads
Updating downloads one update patch, made for your release.
From this site only: the patch (about 15 MB). The page applies it to your four files in its own memory; they go nowhere else. Your four files take about 300 MB of memory while the page works, so close other tabs on a phone.