Almost none of them. Gamecube games range from 14 MB (Animal Crossing) to 1.34 GB (Full disc, like one from a 2 disc game) per disc. The vast majority of games are over 200 MB. Most file hosts have restrictions on filesize. I think the average restriction is 200 MB. So if you want gamecube games that only have 1 link to download...well the math should speak for itself.
Just download multiple parts, it's not hard.