There needs to be a new 1.19+ all discs category since they added the new disc

Can I submit a co-op run if my partner doesn't have a speedrun account?

The great plateau challenge is where you defeat every monster on the great plateau. Since there is no blood moon on the great plateau they will all be defeated. It can be in normal or master mode Glitches or limited, (in master mode the lynel counts.) It starts when you take control of link, it ends when you defeat the last enemy. You have to beat the magnesis shrine since it has the shrine guardian inside. this will explain it