Thread: Diamond problems

I am currently trying to transfer Pokémon from a (friend's) copy of FireRed to my Diamond. What is consistently bugging me is that FireRed is telling me the savegame is corrupt, when it actually isn't. As I've been told to leave at least his lvl 65 Charizard on the card, I daren't restart (especially as he has a nice Zapdos). I load the FireRed and save it normally, load it again and it claims to be corrupt, yet lets me load that same savegame. And then, when I load Diamond, the 'Transfer from FireRed' option doesn't appear. Can someone help me? Just to let you know:
My friend has beaten the League on FireRed once.
I have a National Dex and have beaten the Pokémon League 3 times

I also have a WiFi problem, with a functioning Belkin router but cannot connect. My administrator for the network has approved both mine and my sister's DS's, but still no joy. I checked on http://bmgf.bulbagarden.net/www.nintendowifi.com, and it seemed to suggest that Belkin routers are compatible. The router is the pair for my wireless adaptor, a Belkin F5D7050.

EDIT: I have a European Diamond, but FireRed is American. Could this be the cause?