Pokemon HeX is a free, open-source, browser-based Pokémon save editor powered by PKHeX.Core compiled to WebAssembly. Edit everything: Pokémon details, bag items, Pokédex completion, and trainer data. Instant legality checking with one-click AutoMod legalization, bulk scans with clone detection, batch box tools, and Showdown set export. Supports Gen 1-2 battery saves through Switch titles. All processing runs locally on your device — no install, no upload.