I haven't drawn Charizard in like ages, and I don't think I've ever drawn a Mega Charizard X, so have a uber inflated/fattened one. (This one's name is Vulcan)

--- Story Time ---
Charizards by nature have a tendency to be rather proud, arrogant and even egotistical creatures. Vulcan was no exception to this, He lived up to his species stereotype, he wore it like a badge of honor.

He was strong, he knew this, and he made sure everyone else around him knew this too. For a long time his strength went uncontested, and in his mind he was the strongest Charizard in the entire world, no the strongest in the entire universe, and no one could prove otherwise.

But that wasn't enough for this power hungry Charizard. He wanted to be stronger, so strong in fact that no Pokemon would even dream of challenging him.

One day Vulcan heard an interesting rumor.

The Legendary Pokemon Jirachi, a Pokemon known for the ability to grant people (and Pokemon) wishes was seeking for a new master to serve, as its previous master no longer wanted anything to do with the Legendary wish-granter.

"This is perfect! I'll be Jirachi's new master!" Vulcan declared. "Though why anyone would throw away that kind of potential to begin with? Oh well their loss."

After a bit of searching, Vulcan finally found Jirachi's 'home'.

"Oh a guest~" Jirachi chimed as it floated around the Charizard, inspecting every inch of the Fire-Type Pokemon.

"Are you here to be my new master?" Jirachi finally asked, flying right up towards Vulcan's face with pleading eyes.

Vulcan puffed his chest out "Yes, that is correct" he declared proudly.

"Yay~" Jirachi cheered "Oh, Oh, let me guess, I bet your first wish is to become one of those Mega Pokemon! Right?"

Vulcan was a bit taken back by Jirachi's eagerness. Mega Evolution wasn't exactly something he had actually thought about, but it did seem like a good idea.

"It wasn't exactly what I had in mind, but you know what, yes I'll go with it" Vulcan said with a content grin "I wish to become a Mega Charizard!"

"X or Y?" Jirachi asked

"X of course, it looks much more intimidating"

"As you wish master~"

Vulcan soon found himself enveloped in a bright light, as his body slowly began to change shape.

"Congratulations, You've Evolved into Mega Charizard X"

"I-I don't feel any different" Vulcan commented

"Well you look different" Jiarchi replied

"I get that, I mean I thought I would of gotten stronger by Mega Evolving"

"Well that's the catch, I can only grant you the Physical appearance of a Mega Charizard X, not the power that comes with Evolving"

"What? Why not?" Vulcan asked, with an irritated tone.

"Well im not going to go into the details, but we just don't have the right catalysts for proper Mega Evolution, like a human trainer who you share a close bond with or the mega stones, so this is the next best thing" Jirachi grinned.

"I-I Guess that makes sense." Vulcan nodded "Actually it doesn't matter, since my next wish will fix that!"

"Oh, Do tell?"

"Jirachi, My next wish is" Vulcan paused to take a deep breath "I wish to be the most Powerful Pokemon in the entire World... No the entire Universe! I want to be so powerful that no one would ever dream of challenging me."

"A-Are you sure you want that?" Jirachi asked nervously

"More than anything!" Vulcan roared

"I should warn you that-"

"Just make it happen" The Charizard

"As you wish master~"

In that instance, Vulcan could feel it deep inside his gut, he felt himself becoming stronger, more powerful "Yes, this is wonderful~" Vulcan roared "This power feels wonderful! It feels-"

"H-Hey, what's the big idea?" Vulcan grunted as he noticed his stomach slowly expanding outward.

"You wished to be the most Powerful Pokemon in the universe didn't you?" Jirachi asked

"Yeah that's right, so why am I blowing up like a balloon?" Vulcan grunted yet again, pushing against his expanding girth curiously with his claws.

"Well, thats quite a lot of power, and you have to contain that power somehow right? So your belly is filling up with all the power you wanted."

"Wait... I..." Vulcan groaned, as his stomach continued to pump outwards with more and more power, he couldn't help but feel a little content despite his prediciment, the surge of power flowing through his massive expanding body, was quite the pleasing sensation, and for a brief moment, he was lost in that sensation of growing more and more powerful, literally. It wasn't until his stomach made contact with his chin that he snapped back to his senses.

"Jirachi, I wish for my stomach to be back to normal" Vulcan pleaded.

"No can do" Jirachi sighed

"What do you mean?" Vulcan roared, as his stomach had decided it was going to pick up the pace and began expanding faster and faster.

"Well I can't grant another wish until this current wish is fully granted."

"I-If I keep swelling up like this, I'm going to be as big as a planet" Vulcan groaned.

"I'd say even bigger than a planet, much, much, bigger" Jirachi replied flatly.

Vulcan let out a heavy sigh, it was about all he could do, as he sat and continued to watch his entire body bloat outwards in rapid succession, he had a lot of power to obtain, and he had only just begun.