First of all, you have to keep in mind that you and he may have different definitions of "long", particularly as he doesn't have any way to pass the time while you're reading. What could feel like barely any time for you could be an agonizingly long period for him, particularly as his instincts are basically screaming at him to get outside and train.

Which is something else I should mention. Most Pokemon, not all, but most, are very, very eager to fight, train, and get stronger. Which makes sense if you think about it, after all it makes it easier for them to protect their trainers and help them achieve their goals. If they're prevented from doing so, they get... antsy.

[She glances at Yang. Yeah, self-evident demonstration there.]