Brock rubbed his chin. There was a chance he would turn into a bodybuilder like Max or a stuffed animal like Brendon. They must have wanted to be like that, or maybe it was personality based. Brock's musings were cut short when he realized his hands were turning blue.

"It... it's got me!" he shouted. The blue spread over his body, a thin layer of scales rising from the rash.

"No! Brock!" Ash roared. "Hang on!"
The rock-type trainer smiled inwardly. "A dragon!" he thought to himself, "Alright, that'll show Max who's the man around here! Now, what to look like? I want to be strong..."

His body was becoming more streamlined, as a pair of blue curvy horns grew out of the back of his head. His previously tanned face was replaced by a white streak that ran down his frontside.

Brock grinned. The ladies wouldn't be able to resist him now! His mind refused to register the fact that he was shrinking. His body was becoming smooth, his muscles quickly losing tone.

"And handsome..." his eyes growing wide, for the first time in ages. Misty gasped. "Perfect! Even Misty will be stunned by a pair of great eyes!"
She had never actually seen what color Brock's eyes were!

"Where... was I? Oh, and I wanna be cute!" Brock held his hand to his rounding chin. Each digit of his hand was quickly melding back into his hand, the whole thing becoming nothing but a single, pointed nub. His clothes were huge now! Oh well, what did he need them for anways!? His short, reptillian tail was the only thing holding his pants on him at the moment. He was only about two feet tall and still shrinking!

"Alright, this is it!" in his cute, still adolescent-sounding voice called.
"Brock...!?" The kitty that had once been May scampered up to the chibi dragon.
"Look May! I got my wish! Lookit how strong I am!" the newly transformed Brock held up his nub of an arm and flexed it.

"Uhh... wow?" May decided to humour him, "Yeah. Yeah! Now girls will come running to you instead of you running to them."

"Girls!? Eww... no way!" Brock stuck out his tongue, disgusted. "Why would I want icky girls to come play with me?"

Nearing the end... Done by  Grandstorm.