>>558492621, pikachu because it's the franchise's mascot
2, umbreon and espeon because they are crossgen evolutions and showcase the new day and night cycle and friendship mechanic and different evolution methods and new dark type
3, milotic because it shows hoenn is very aquatic and tropical themed and showcases the contest stats and pokeblock minigames good
4, gallade because it's an additional crossgen evolution gen 4 added more and showcases the brand new physical special split with its psy/fight type
5, braviary because it showcases unova is a soft-reboot and is an american themed in contrast to the japanese previoius regions
6, sylveon because it showcases the new fairy type and affection mechanics
7, alola muk because he is made of rainbow sand now and showcases the new regional variants in gen 7
