Serperior - Trailer
Zoroark - Gifted as N's old Pokemon
Coballion - Foreshadowed capture
White Kyurem - Mascot legendary
She just needs two to counter Nates Lucario and Arcanine, but since they wouldbe random encounter captures, she needs something else from the ranch and the complex. So Ampharos/Azumarill and Magnezone(?)
Or we can just count the trailer as non-canon bs like with the ORAS one and give her Shiny Dragonite and Volcarona