As far as I know, like 99% of these are transferable and even tradable. I don't want to say 100% because I don't think anyone (not even me) has taken the time to officially transfer each and every one of them. And yes, all or most of them should have Pokerus and will either be shiny + every legally possible ribbon OR come from a Gamecube game (I think it's XD?), have those exclusive ribbons, and not be shiny. I only did that for some of them (Spearow I think) because I figured they can learn more competitive moves, or in the case of something like Spearow you already have a shiny Fearow so I thought I'd mix things up.
BTW I also have done this for every other generation game but I didn't want to clog up these forums with my stuff (6 other save generations). I shared Gen 3 since I know a lot of people are still on that, but if any of you guys want me to post the other saves let me know! They have the same routine (shiny, competitive, all ribbons, Pokerus, etc...). Also this is the first time coming back to this thread and I didn't realize people were responding to it so thank you Slayer for moving it and restoring the lost files!