After thinking about this for quite sometime, I have decided on two possibilities for the nicknaming scheme that I'll be taking in X:
a- digimonizing the names: as in Renamon for Foko, Imperialdramon for Aurorus and Magnamon for Xerneas
b- going yugioh zexal on my mons and giving them nicknames that start as following: no. (insert numeral) (insert a yugioh-esque name).
i.e for Aurorus I'm thinking maybe ( No. 2 Aurora sailor) and for Xerneas ( No.44 ForestaPsyche X).
God I just love symbolism XD
I just hope that Mr.heartland and the Barian lords won't be coming after me in X, team flare is enough XD