yes

Ash then went to Pr. Oak and explained him the plan and told the professor that the only thing he had to do was after Ash became a female shiny Charizard to send him inside a pokeball towards Charicific Valley.

The professor nodded before Ash took out the Chariard Costume were the professor was amazed how realistic it was apart from the claws and fangs which were made of plush like material.

on the back of the Suit was an oppening which after taking of his cloths Ash first put his lower body in and then his upperbody and hands, where he saw nothing because his head was barely at Neck hight.

Suddenly he found himself sleepy and fell to the floor asleep while the Suit did it's thing as he laid on the ground.

first of the changes happened to his Neck and head, as his neck expanded in both Lenght and width to fit the Costume, as his head rearanged itself with the neck now leading to the back of his head instead of under his head, and when that was done, his head molded into that of a charizard with his eyes pulling to the sides, his mouth extending into a big muzzle same with the tongue which extended to fill the mask, as from the back of Ash's new head extended to horns to fill the rest of the head, as the Head and neck then fused with the costume which the Professor realized when the plush teeth were replaced with razor sharp ones and when a smile appeared on the now draconic muzzle.

Next was the stomach with the fake wings and tail and since the exit was sealed the moment Ash entered the suit, that wasn't a problem as his stomach expanded in with and also a bit in length, while bonestructure extanded from his tailbone and shoulderblades filling the tail while the insides turned from cotton to flesh, blood and vains, as a massive flame appeared on the end of Ash's new tail, meanwhile the Organs changed to fit a Charizard, meanwhile even though it was hidden his dick gained in length and with while ridges appeared on the dick as the top turned into a barb, and that was the ending that section leaving only the feet and arms.

first the arms as his arms shrunk a bit in size which it gained back in width, as Ash's index and middle finger as well as Ring finger and pinkey fusted together giving Ash the Clawed fingers which also gained some width.

and lastly like with the arms, his legs lost a lot of lenght but gained a lot of width, then on the his feet expanded to fill the feet of the costume as from the bottem of the feet at a thick paw pad appeared, when that was done Ash toes had long since receaded into his massive feet being replaced be 3 massive clawed toes.

with that done both arms and legs fused with the the suit ending the transformation as now in fron of Pr. Oak laid a 10 feet big shiny Charizard.

as in Ash's mind new instincts appeared which gave him the knowledge of how to use his new body and how to battle.