Don't remember if I implemented said feature in the currently out PvA demo. Idea was that when a Pokemon would speck, the cry of said Pokemon would be heard. The same type the you hear in the main Pokemon games. Even was going to get a bunch from the PokePark games, which have way better cries that actually sound like what each Pokemon would sound like... As far as something like the anime goes.

But... Deciding to drop it. Some reasons being...

Time to program in each one so they trigger currently.
File size that they add onto the game, which would help with game performance if removed.
The tone of the cries do not match the moods and characters. Like if we have a evil Lopunny that is going to start a fight, and the cry sounds light and cheerful. It throws off the character design.