hoppas part of gen 6 omg idk also volcanion are the 2 idk about well i knew volcanion and hoppa but didnt know they were part of gen six
also besides those two i fell like best pairing and wut not will go as follows diantha and diancie, since zygarde has 2 main cell each cell will be pared with 2 of the team flare admins also zygarde should have all the forms exept base cuz come on hows that gonna work. the first cell u find will always be in 10% and second will always be in 50% once u have both u get access to 2 side quest one for the fivesome with the admins and the other to have sex with the complete form also for diantha u should have her gardivoir with her so like a three sum and afterwards u get access to a side quest for another threesome but her gardivoir is mega evolved also for the pyschic gym leader paring her with xerneas seem best and yveltal with korrina the fighting type gym leader and maby a threesome with her lucario with the same side quest thing as diantha and for serrena, shuana and the kalos queen u should have to do a pokemon showcase againts each and once they are defeated u can then do them and once u have defeated all of them i think i side quest for a foursome with all of them would be cool
edit: actualy parring hoppa with the pychic gym leader seem like a better idea i thought of xerneas first not knowing hoppa was part of gen 6
edit 2: serena shauna and the kalos queen (idk her name srry) are in the anime.
p.s. ive never played the games only ever watched the anime