If you level up Torchic till it evolves to Combushkin then it'll have a chance against Roxanne's pokemon but for Treeko & Mudkid, those 2 just needs to be at the level where Treeko learns a basic grass type move or Mudkip learns a basic water type move.

Corocoro is here.
http://www.serebii.net/corocoro12141.jpg
http://www.serebii.net/corocoro12142.jpg
http://www.serebii.net/corocoro12143.jpg
http://www.serebii.net/corocoro12144.jpg

-Landorus/Thundurus/Tornadus, Suicune/Raikou/Entei, Mesprit/Azelf/Uxie, Regigigas, Terrakion/Virizion/Cobalion, Cresselia, Heatran were all confirmed for the games.
- There was a special post game episode(Similar to the Looker one from XY) revealed having to do with Rayquaza and Deoxys
-Deoxys will be catchable in the game
-Zinnia, a character found in the datamine was revealed, she is a dragon trainer and has a Whismur and a Salamence
-Blaziken learns Ice Punch now according to the Official Site

https://www.youtube.com/watch?v=4HlADiJFI5c

"You can get every Pokemon between X, Y, OR, and AS."

Including a special Deoxys event. :O

I'll gladly take my third heh. Now if they truly mean every... I hope there's some Shaymin and Manaphy plans in the works too.

They most likely mean everything barring events(Aside from Deoxys).

Deoxys? My third favourite pokemon? Nintendo, you awesome company.

You should be thanking Game Freak, they make the game.

Damn. You're right.
Thank you Game Freak, for continuing to keep my interest in all the Pokemon games that come out year after year by doing awesome things like these!

Shhhhh I want to dream of having legit ones of those one day. :')

I always wanted to go to space as a kid.

Deoxys? Neat. He always had a slick design~

Why? We still have 2 Pokemon literally impossible to get right now...