(Kanto region in this story may not be completely accurate. I'm more of a Sinnoh lover myself)
Red ran across route one excitedly. He couldn't wait to beat everyone's pokemon up and become head honcho of the Kanto region. He'd just beaten that bastard of a loser Gary with his baby Charmander. The look on that dumbass' face as he tried to play it off in front of his grandfather was priceless.
As he made his way to Viridian city, annihilating the other newbie trainers along the way, he came across what he thought was a pokemon uncommon in the area. It looked like a ditto, though it lacked its beady eyes. What was its most distinct feature was that it had a different color from the ditto he knew. Could it be a unique, shiny ditto? Hell yeah it could!
Red chucked a pokeball towards it... only to miss it by a mile. Tsk. He then proceeded to throw the rest of his pokeballs towards it. Hey, there was no rule that he had to throw one at a time, was there? True enough, one of them managed to hit before it sucked the blue blob inside. He quickly jumped and sat on it. He always wondered why people never forced closing their pokeballs to guarantee their chances of getting a new sla-- companion.
When the ball stopped shaking his ass, he picked it up and called out the pokemon. The ditto jumped out and bounced on the floor.
"You and I are going to storm this entire region, Ditto," said the young trainer as he smirked at it.
He felt like the little blob looked at him weirdly before jumping excitedly and calling out, "Ditto! Ditto!"
Red nodded in satisfaction.
Shit. Rimuru knew he fucked up, big time. He just didn't know what he did to piss off Ciel to the point where she kicked him across dimensions to a foreign world. He tried transforming back into his human form, but found out his assistant had locked his powers.
{Talk to me when you realize your wrongdoings, master. Until then, enjoy being a normal dumb slime :P }
Why that little...! Rimuru sighed in defeat. Suddenly he felt something hitting him before feeling himself becoming smaller. Had he just gotten captured? On the first minute that he landed? Wow.
Not a moment later he felt himself getting called out. He was now facing a familiar looking boy, with a red and white cap, holding a pokeball in his hand. Wait a minute. Pokeball?
"You and I are going to storm this entire region, Ditto," said the familiar looking boy.
...yep. He thought right. He was inside his childhood game! The rush of nostalgia felt like the time he was able to taste food again.
"Ditto! Ditto!" shouted the Demon Lord excitedly. Rimuru was going to make sure he lived his life here to the fullest before Ciel finally realizes he was enjoying his time here and takes him back.
Look out world! Ditto (Rimuru) is coming for ya!
(Don't expect anything good from this story. In fact, don't expect another chapter coming soon. This was just something that came into mind unexpectedly.)
(But still, let me know if you want me to continue this, or tell me that it's shit and I have to drop it.)