I have read some english wiki about pokemon GEN1 save data structure. but I can't fully understood what the wiki say. so could you please explain for me more understandable english? I know, there is many kind of editor but not compatible with jap characters and green version. http://bulbapedia.bulbagarden.net/wiki/Save_data_structure_in_Generation_I link above checksum section. I'm very appreciate if you tell me the calculation formula or source code or tools. Thank you so much for your help. Thank you.