Okay. when i fought him i was level 36. people are always like "zomg zaldeen iz lyke zo hart!!!111elventyelven!!!111" well it is true, on proud mode, but here is how you beat him
Be sure to ALWAYS sharge up your JUMP, by doing the reaction command when it says Learn, click triangle atleast 5 times, then attack him with jump with all five times......... hit him with combos and if mickey comes, just attack xaldin until you die with combos and Pearl, which i think is overpowered but use that for your advantage....
and if this doesnt work, it's because i beat him on my first try standard mode, and i couldnt really tell wtf was happeneing so good luck