Decidueye is my main in unite

For grass, mine has to be chespin, I'd choose cinderace for fire, blastoise for water, ditto for normal, raichu for electric, victini for psychic, toxicroak for fighting, tyranitar for rock, gliscor for ground, charizard for flying, charjabug for bug, Gengar for poison, a tie between weavile and tyranitar for dark, Gengar again for ghost, Weavile again for ice, magneton for steel, dragonite for dragon and slurpuff for fairy.

ok

Grass=venasaur Fire=blazikin Water=Marshtomp Normal=Ditto Electric=electrode Psychic=alakazam Fighting=conkeldurr Rock=golem Ground=torterra Flying=pidgeot Bug=butterfree Poison=beedrill Dark=spiritomb Ghost=gengar Ice=dewgong Steel=ferrothorn Dragon=hydreigon Fairy=Sylveon

Mostly same, except for incineroar for fire, Regirock for rock, Groudon for ground, golisopod for bug, and dialga for steel

I'm a gen 7 player, played Moon and Ultra Moon. Chose Rowlet in Moon and chose Litten in Ultra Moon