can't edit save file of my Japanese copy of crystal

[ChaoLan]

Whenever I try to load it in pkhex I always get this error. I have the same issue on my copies of emerald, sapphire and silver.Pocket Monsters Crystal Version.sav

Pokémon Saphir-Edition.sav

[Kaphotics]

The sapphire save you've attached doesn't look like a valid save (doesn't have the block footers one would expect every 0x1000 bytes).

Please double check that you:

1. have saved in-game (if using emulator).

2. have a valid cartridge (not a reproduction / fake).