Quoted By:
Primeape
Cloyster
Wigglytuff
Butterfree
Tentacruel or Dragonite
Skarmory
Slowking
Flygon
Milotic
Magnezone
Weavile
Froslass
Krookodile
Braviary
Whimsicott or Lilligant (Both popular, will go either way)
Carbink (Unova got 1 mega in ORAS. Let's do the same. I predict Carbink (Alola E4). Same DNA as Diancie who can Mega Evolve.)
Either Whimsicott or Lilligant, Mandibuzz, and the lack of Kalos megas will tell players that Mega Evolution will continue in the future like how they left out Butterfree, Slowking, Froslass, and the lack of Unova megas in ORAS.