At this point you're better off using a save editor? But if you wanna do it the old school way, peep this - https://bulbapedia.bulbagarden.net/wiki/Choice_Scarf
The mediafire link in the OP works for meI'm 11 years late but I think there's no download link anymore. Trying to talk to the author would be completely useless as he was last active in 2017.
you can edit your savefile using pokehex - https://projectpokemon.org/home/files/file/1-pkhex/Help I sold the Skull and Armor fossils because I didn't know you need 492 pokes the catch Arceus is there Any other way to get these two fossils?