I was a bit confused about what you meant by version, and I am playing the Wii u version.
for agitha i think she might be a bit underleveled for that, i dont think she is more than 55 at the moment and the best I got with her in that stage was at about 990 out of 1000 which was so frustrating
in relation to the kill so many enemies in 10 minutes i am having a lot of trouble with the one with ghirahim in the sealed grounds.. I just cant get it done in 10 minutes with an A-rank rating. hopefully if I level him a lot it will be possible