Using a pre-made save file for streaming, speedrunning, or competitive leaderboards is generally frowned upon unless stated otherwise. Be transparent if your "100% playthrough" started from a downloaded save.
Furthermore, via apps like Syncthing allows players to use the same Sacred Gold save file across their PC, phone, and handheld, keeping their progress seamless. sacred gold save files
Files like Hero00.PAX contain only your character's stats, skills, and inventory. These are created via the Export option in the "Esc" menu. How to Use These Files Sacred Gold Export function not working? , page 1 - GOG.com Using a pre-made save file for streaming, speedrunning,
Files like GAME01.PAK or GAME02.PAK store your actual progress in the world (quests completed, maps explored). Files like Hero00
Only needed for obscure modifications (e.g., unlocking certain event flags not visible in PKHeX).