Lol why wouldn't they?
Had no problem adding Tangrowth, Yanmega, Mamoswine, Lickilicky, Ambipom to Johto-dex.
Unless itd be too strong for when you get to ~30 lvls?? Doubt it since you can get an Alakazam at lv.16 etc....Chargestone cave in BW2 wasnt a problem either.
The only thing that I dont like about this is how Banette doesnt evolve