For me it is

wild: gen 4
trainer: gen 3
gym: Gen 2
Villain team: Team Flare
villain team commander: gen 5 (Colress from bw2)
Villain team leader: Cyrus. Gen 4
Legendary: dialga and palkia
battle frontier boss (this includes the subway train and battle maidon): ORAS Battle chattelaine.
Champion: Cynthia gen 4.
Rival: Gen 2, Silver.

If i missed any out. Include them in yours and then i can update mine lol