I’d nearly cleared the Concept Gallery, but then there was a whole soundtrack!
As I found out at the end, the green credits are in fact called Friend Credits, and are only obtainable if you use the online functions that are no longer available (without doing fancy things like connecting to fan-run servers, which is still difficult and sometimes requires special hardware). Therefore, the items that require Friend Credits are out of my reach. At least there’s still a lot I can see!
I have to say, it’s really cool that you can listen to the entire soundtrack of all three games in one place. It would be even cooler if I could listen to it on a portable device because I like listening to music on long drives, but for the time this game released, this was still nice. I guess, if you count YouTube videos of people ripping the soundtrack, it is available on mobile, but I generally don’t count YouTube. It’s not official and it takes way more data than just having the sound files. Other games have done this sort of thing on slightly more usable consoles (Pokemon Super Mystery Dungeon for 3DS, Super Smash Bros. Ultimate for Switch), which is definitely nice. I just prefer to be able to buy it for my phone.