Poison Couple: Nidoking and Nidoqueen TF/MC

DISCLAIMER: This is based on an idea from that I was given permission to use. I merely modified it slightly, and all credit for the original idea goes to him. Thank you.

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It was a fine day in the Hall of Legends. In fact, it would have been a perfect day if it weren't for one thing: Dialga and Palkia fighting. No one save Arceus and Mew knew why the two always fought or what caused their spats. What they did know, was that some inevitable mishap would result from these results. Today was no different.

"You're a jerk!"
"YOU'RE a jerk!"
"Your roaring is like a dying duck!"
"Your roaring is like a whoopie cushion!"

Yes, these great Legendaries spoke exactly like that when fighting, complete with tongue sticking out at each other and playground insults. As you can guess, they had an unspoken agreement to act SOMEWHAT more professional when being watched by humans. As it stood, Palkia stuck her tongue out at her brother and turned her back on him...

...and her tail smacked the container of Plates Arceus had, sending the plates flying.

Fortunately, Dialga and Palkia caught half of them.

Unfortunately, the rest of them happened to descend to Earth, landing all over the place. Dialga and Palkia stared at the spot where the places had been.

"This is your fault." Dialga said, sticking his tongue out at his sister and this beginning the argument all over again until Arceus finally put a stop to it three months later.

Meanwhile, Ash and Misty were walking along the beaches of Fuschia City. Ash had recently lost the Kalos League and went home before planning his next move. Imagine his surprise when Misty showed up, since he presumed she was running the Cerulean Gym and didn't have time to spare to see him.

One mallet later made a disagreement begin. Then the disagreement became a fight. A typical fight for the duo: as they enjoyed fighting as much as they did each other's company (even if at least one of them didn't know it).

As they argued, they didn't notice the plate until it literally buried itself in the sand and send a shockwave of energy literally all over the surrounding area, including much of Fuschia.

"Ugh... What was that? Misty?" Ash said, rubbing his head. He didn't seem to notice the purple scales forming on his hand.

"A plate of some sort. Wonder what it does?" Misty asked, as her face began to expand into a reptilian muzzle with teal scales covering it, and her ears grew larger and moved to her head. Like Ash, she didn't notice it.

"Who cares? Let's sell it!" Ash said, as his belly expanded, growing creamy scales on it. Both kids began to age up as their respective scales covered their bodies. All of their clothes vanished save for Ash's hat and Misty's bikini, as it rapidly became a plus size.

"What? Why would you do that?" Misty roared, as her tail grew out to an immense size and her arms and legs became stockier: gaining muscle and fat.

"For money, duh!" Ash said, as his own face became a reptilian muzzle and his tail grew. His own arms and legs became like Misty's, but with more fat. Misty opened her mouth to say something as the past began to change, and the ensuing memory change knocked her onto Ash, and they kissed.

Ash remembered being a normal male Nidoran until Team Rocket did gruesome science experiments on him to try to make a smart Pokemon like Meowth. While it worked, it let him be able to escape, which he did. Wandering about, he encountered Professor Oak in Pallet Town. Though the Professor was startled by a talking Nidoran, he helped Ash out, and evolved him all the way to a Nidoking in the hopes that the evolution would reverse the situation. While it was unsuccessful, it did give Ash the ability to go and rescue his family from the Rockets' secret lab in Fuschia. With help from the Professor, a Pikachu he'd met in the Professor's lab and befriended, and tons of other Pokemon he'd met and befriended on his trip, he entered the lab and freed all the Poison Pokemon in it, as well as his family. Ash's father Koga, his mother Delia, and a Gengar named Morty who had been captured in Johto and brought to Kanto by the Iron Masked Marauder teamed up to found Fuschia City for all the now enhanced Poison Types. After a successful plea to the Elite Four and Champion of Kanto, Koga was allowed to open a Gym in Fuschia, where he and Delia battled Trainers. As for Ash, he continued to wonder the Earth, befriending human and Pokemon alike. While he was a bit too distracted at times, and could eat a bit too much (no matter how much his mate tried to excuse it as having more to hug), he still had a good heart. Perhaps that was why Ho-oh had blessed the city.

Misty remembered being a Team Plasma creation: one so secret not even N or Ghestis was told about. She was created as a test tube Pokemon by scientists who had been working for Team Rocket and fled when Ash came to whoop their butts and free his family. As such, she was created as a Counter and an assassin. As AP-01, she was responsible for countless assassinations, having been groomed that way from birth. Eventually, she and Ash fought, and she lost. Ash and Pikachu saved her when the scientists tried to detonate a bomb in her head, and as a result she found herself falling in love for the first time. Despite her turn to the side of good, Misty still had blood on her hands, and was spared from execution only by a very good legal defense by Hoopa (of all Pokemon), Mewtwo, and Celebi. Most of them had been victims of brainwashing, and supported her in her case. (Hoopa merely wanted to wear a suit and shout "Objection!") Even so, she was distrusted and hated everywhere but Kanto and Alola (where everyone was prone to forgive and forget.) As such, it was no real surprise that she mated with the one Pokemon who saved her and had been supported her... And it wasn't Pikachu. She didn't know everything about living a normal life, but Ash was helping her live one.

Eventually, the two broke the kiss.

"Ash, what were we fighting about?" Misty asked, confused. Ash looked around as well, and saw the plate.

"I guess it was what we were going to do with the plate, but if you want to take it to the Professor we can do that." Ash said, hugging his fellow chubby Nido.

"Of course." Misty said, picking it up and putting it under her arm. "Don't forget that your sister wants us to come with her to Unova for a concert."

Ash laughed.

"All right, I won't. I hope Janine picked a better guy than Harley. Guy stunk worse than a Toxic attack."

The two continued to talk as they walked back to Fuschia City. Little did anyone know that Fuschia City would not be the only place effected by a Plate...