No, it can't(ish). It can be pre-purchased/pre-downloaded. It won't get datamined either, and here's why:
http://pastebin.com/28CW3zxq
We are still going to have some mystery come the 18th.
EDIT: As our friend R_N just pointed out over on Serebii Forums, these are Lass Ellie's Mons' specs:
Pokemon: 2
Pikipek (Lv. 36) (Nature: Serious) (Moves: Rock Smash/Supersonic/Fury Attack/(None)) IVs: 31/0/31/31/0/0 EVs: 0/0/0/0/0/0
Rockruff (Lv. 36) (Nature: Serious) (Moves: Bite/Howl/(None)/(None)) IVs: 31/0/31/31/0/0 EVs: 0/0/0/0/0/0
Hopefully this is indicative of the main game, and Trainers will have some beefed up IV's here and there.
Also, Lass Ellie for Champ!