I realized I should do a permissions thing too, now that I've decided on the nature of N's Pokemon communication is.
N can understand and speak to any Pokemon or animal through a form of telepathy. If you don't mind him chatting up your animals and probably asking creepy stalker things like where you're from, if you still live in your mom's basement, what color underwear you have on today, please let me know.
Normally the way this works is that you voice for your character's pet, in italics or action tags, and N responds back.
N is unable to talk to humans, demons, etcetera through his telepathy unless they are significantly animalistic. Even then, it's entirely up to you whether or not N can communicate with them.
At this point in time, N does not recognize his ability as telepathy and has a hard time discerning between what is said out loud and what is said mentally. He always speaks out loud to his Pokemon and other animals, but it is possible he could learn to do so non-verbally.
His current range is probably not much farther than that of normal earshot.