...But can you have two memory cards containing save data from different regions plugged in the system at the same time? Or can the GameCube only handle one at a time? Also, can you transfer saves from one region card to the other if it's a safe game? Thanks.
Whoever started using the word "canon" in this context, anyway? I hear it all the time now, and I'd like to slap him. - Green Gibbon!
It's difficult to explain yet works in both directions.
See... Freeloader and modchips do NOT toggle console language setting (an approach some games have compatibility issues with). Crucial distinction to understand how this works. Saving JPN games on a US/PAL console, or US/PAL games on a JPN console, will save them under the console's native memory card format.
For example if you're playing JPN games with a US/PAL GameCube, any saves resulting are actually in US/PAL format. So they cannot be either copied to true JPN memory cards or used on a JPN console.
What's the buzz? A high voltage positive ion attack!? Chaaa!