[For a moment, N looks affronted, thinking the comment was aimed at him and not Astral. Well, he certainly knew more about Pokemon than this boy did...!

But before he can make his retort, he seems to realize that Yuuma is holding conversation with... thin air. He tilts his head and squints, as if straining to see whatever Yuuma is really speaking to. He quickly gives up, though.]
Even if Litwick believes he is prepared-- though I would admire his courage-- it can be dangerous to take on a gym with under-leveled Pokemon. And the rest of your comrades do not seem quite so eager for the battle.

[He sighs lightly.] I would advise that you take time to train and strategize.