The term has been modified so much... I think it means Criticise & Comment.
Anyway, Your sprites were... well, boring.
Pikachu x Pachirisu is such an overplayed combination. It looks fine, but it's incredibly easy and not all that creative.
Flying x Buizel; why does it only have one wing?
Skipping over the Sharpedo. o.o
Riolu x Pichu, not only is it not all that creative, it also has four ears. If you add new ears, you need to get rid of the old ones.
Rotom x Cresselia doesn't look completely connected. It looks like several different sprites floating in the same area.