Rather than retyping six Pokémon and their levels, natures, abilities, items and moves, hand the tracker the save file your emulator already wrote. It reads your party and box straight out of it.
There is no server to send it to — this is a static site, and the file is read in your browser and parsed there. What comes out of it is stored in that browser's own storage, on that device, and nothing about your run is transmitted anywhere.
.sav,
or .sa2 or .fla depending on the emulator.A run already in progress can be refreshed from a newer save, and the line it draws is what the game knows versus what only you know. Species, nicknames, abilities, items, natures, moves and who is in the party come from the save. Your KO counts, status marks, graveyard entries and the notes on them are never touched — the cartridge has no idea which of your Pokémon died to a critical hit on Route 3.
One quirk worth knowing: a boxed Pokémon is stored in a compact form that carries no EV data at all, so a refresh will not overwrite EVs you typed in for anything currently in the box.
Radical Red does not store abilities in the save — it recomputes them from your trainer ID. The tracker replays that same calculation, so on an ability-randomized run the Pokédex shows your run's real abilities rather than the defaults. The species and learnset randomizers are not recoverable that way, and the tracker says so instead of showing you numbers that would be wrong.
The tracker works by hand too — record each area's encounter as you catch it and everything downstream still works.
Start a run Pokémon locations