question about battling a friend w/gb link
I have a couple questions about battling a friend using a gameboy link.
My friend from Germany has the German versions of yellow and gold.
1. Can I battle my friend with a gameboy link using the US version of the game?
2. If so, can I only battle with equivalent versions? ie, Do I need a yellow version to battle my friend's yellow version, or could a gold/silver/crystal battle the yellow?
Thanks so much for your help!