I don't know for sure first hand, so please someone correct me if I'm wrong. I would also like to know about games that carry updates for a FAQ I'm writing. Please note that I have no personal experience with this games and don't know for sure if the information below is correct at all.
Metroid Prime 3 NTSC-U -> 3.0u?
Super Mario Galaxy NTSC-U -> 3.0u?
Super Mario Galaxy PAL -> 3.0e?
Wii Chess PAL -> 3.1e?
Donkey Kong Jet Racer PAL -> 3.1e?
Donkey Kong Jet Racer NTSC-U ->3.1u?
Wii Fit NTSC-J -> 3.1j?
Wii Fit NTSC-U -> 3.1u?
Smash Bross NTSC-J -> 3.1j?
Please, let me know of any more games that carry updates and what version those updates are if you know.
I would think, Endless Ocean would have 3.1. That's just a guess, but it's a big game, and it came out in the US after the 3.1 update, so it's sure to have it. I mean, why would they put the 3.0 firmware in it?