Khelfin would have prefered it if he got to drive instead of Aro, but he didn't want to make a fuss about it either. So he swallowed his pride, returned all his pokemon to their pokeballs, and got on the back seat, holding on to Aro. 

"I hope you drive better than I assume you do. I didn't survive the Apocalyps just to die now on a motorcycle." 

With Khelfin, you couldn't always tell if he was joking or if he was being serious. His sarcastic comments had this neutral tone to it. 

"Well then, my knight in shining armor. Our fierce steed is ready to gallop." he said without even smiling a little, clearly expressing his inner eyerolling.