Stephen couldn't blame Professor Oak for pushing them out, because he knew that the professor was very busy. He was sort of worried for the professor because he looked so tired, though Stephen reasoned that the professor was old and had enough experience to deal with it. So instead of worrying about the professor he switched his attention to the pokedex, or rather, the pokedex manual.

The pokedex was certainly a complex machine but the manual made it somewhat harder than it needed to be. Stephen quickly thumbed through the manual which was full of technical terms he neither understood nor cared for before coming to the pages he wanted.
"Let's see..." He muttered under his breath.
He pressed the on switch on the side and the pokedex screen suddenly began to glow, startling Tim and bringing a small cry of surprise from Stephen. He quickly lost himself checking out all of the features of the pokedex, surprised at the utility it gave him. 

There was only one filled entry, Tim, his Spearow. Stephen found this odd so he checked the manual.
[i]"Only pokemon you've caught fill the pokedex, huh?"[/i] Stephen read.
He also noted that if he saw a pokemon then he could look at it in the pokedex, as proven by the Tangella entry being available, though it was empty as he hadn't caught one yet.
[i]"I don't have Wynne's Charmander though."[/i] Stephen thought.

He surmised that he had to see it when he had the pokedex, which made sense since the various pokemon he'd seen in the morning and his family's pokemon weren't in the pokedex either.
"Hm..." Stephen hummed thoughtfully.
Suddenly the Bulbasaur entry became changed its status. Stephen lifted his eyes away from his pokedex to find that the odd scarred boy had brought out his chosen pokemon. The boy declared his intention to fight and the gears began turning in Stephen's head. Tim moved excitedly on Stephen's head but Stephen didn't want to fight the boy. Instead, Stephen quietly made his way to Wynne's side and began whispering to her.
"Hey Wynne," Stephen said. "Why don't you fight him? I'm pretty sure you'd win."