"Well, kinda-" Charlie began as Jess asked him about his quarry, a reasonable deal of skepticism evident in her tone, "It's kind of this weird natural phenomenon- you know what Eevee are, right? Moss Rocks have this weird little thing- elements inside of them that cause them to evolve into specific Pokemon. Friend wanted me to collect a bit of the moss and, well, uh- here I am wandering around in this place, I guess."

The girl seemed nice enough, which was a reassuring enough contrast to the other girl in the group who he had interacted with; so, as she recounted her route into the forest to him, he nodded and pulled out his map, his eyes tracing up it as she spoke.

"Oh, looks like I'm down pretty far south..." He mumbled to himself, mentally cursing himself as he picked out his rough bearings on the map, before he lowered it to look at the girl and her friends, "I, uh- I really appreciate the help and everything, but would you mind if I- ummm... tagged along with you guys until we reach Ouvert Way? I promise I won't be a bother, it's just... kind of a lot further south than I thought I was and I'm low on repels."

The Gastly watched the little Zubat swoop down towards it as it hissed and cackled, and as it was noticed by the bat, it shot the fellow poison type a grin.
And got a Supersonic to the face in turn.

With no real room to dodge the blast of sound, the ghost took the attack straight to the face; and shuddering, it hissed in confusion as its pupils began to spin around and around in delirium, moving faster and faster, from regular to erratic as they went; before the Gastly shook its head and stared forwards, directly at Belial. 

For about ten seconds, the Gastly just stared at the Zubat, an extremely ambiguous expression upon its face,

And then the Ghost just broke into a high-pitched cackle, seemingly not even bothered by the Zubat's attack. If anything, it seemed to have been endeared to Belial slightly; if the slight recedence of the grin into a less disturbing smile and the movement of the Ghost around the little bat, as if inspecting and sizing him up, were any indication.