To be more specific its day 194 mission 57 and the way i did it is don't fight anyone else but the commanders just go to the maze and fight them and it may be dropped by them usually for me the 2nd and 3rd commander always drop it. Pus you'll be lucky enough f you get a random bonus.
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The World That Never Was
it is black with a dark crystal near the end.it is NOT the heart opening keyblade from kingdom hearts 1
You cant get dark form, but the more you use other forms the more chance of you forming into it. Also specific boss battles have more chance of forming the dark form.
Riku is seen with the Dark Keyblade when Sora talks to him in Hollow Bastion in the original Kingdom Hearts game. However, Riku changes it when Sora fights him.
It isn't something you get, Riku has it as a sleight already, but only when you enter Darkness Mode. Along with that he has Dark Break and the rare Dark Aura, see what works best for you!