I think the speech is cut abruptly in a way that doesn't let the listener know what she was going to say. Or maybe the ちょっと was her way of hesitating to say something. In other words, just a filler. She was basically saying "I like these cute pokemons but in battles I rather use Bangirasu [and other pokemons like that] [because...]". What came next is just a matter of guessing for us listeners.
She seems to say a few more words (which can be seen by the movement of her mouth) in the next one second or two, but we can't hear that because the audio is taken over by the narrator.
I would say this would have felt unnatural and incomplete if it was part of a normal conversation. If someone does that, the listener would say "...and?".
ちょっと as a polite refusal is possible in other context, but I don't think so in this context.