A/N: Okay, so my idea of posting a multi-part prologue has gone out the window as I haven't gotten it done...in months. ^^' So, you know what? I'll just do a normal prologue and just sum up what happens up until where I start chapter one. And this prologue is all in Yusei's POV...but I feel it's probably going to be more of an inner monologue than a prologue X'D Oh well! On with the show!

DISCLAIMER: I do NOT own Pokémon nor Yu-Gi-Oh! 5D's. Both go to their respective owners. I only claim my OC(s).

Prologue- Boy From Another World:

(Yusei's POV)

It's hard to say what all happened that brought Ren to us three years ago. I found him, bruised and bleeding, when I heard a noise and saw a strange creature darting away. I was sure he was only a step away from death's door, but miraculously he survived and awoke a few days after. It was surprising that he even woke up in a short amount of time. Of course, even with this small miracle, there was a small snag in his waking up.

"Can you remember what happened to you?"

"I...no, I can't remember anything."

It was very strange. The only head injury he seemed to have sustained at all were the gashes on his right eye. Whatever had happened to him had caused him to forget everything, not just the experience. The best he could remember was his name, what the blue and white otter creature he was with was, and also the strange spheres that had been on his person. Anything beyond that—friends, family—were all gone. He couldn't even recall what they looked like in case they ever came looking for him (then again, with what all he told us, that would have been impossible; it sounded like he came from another world).

His recovery was slow. He had been suffering from malnourishment and some dehydration. Whoever did this to him must have kept it to where he could barely have the strength to fight back, much less run away. Various scars littered his body, a few looking like burn marks. I couldn't recall any duel gangs doing this kind of damage, but who knows. Maybe they were trying to get information out of him? Perhaps on where he got Emily (the blue and white otter creature which Ren called an Oshawott) on the off chance there were more powerful ones. No one wanted to even think what could happen if that were true.

During the early stages of his recovery, Ren ran off with Emily, taking his belongings. The first thing that came to mind when he vanished was that his captor could have come in and taken them. When we did find him (after a bit of a surprise of seeing some of his more intimidating partners helping him walk), Ren revealed that he only snuck away, not get kidnapped again like we thought.

"Why would you-"

"I feel like I'm being more of a burden. I don't like feeling useless. I guess that's a personality quirk that stuck with me even with my amnesia."

"I already told you. You can pay us back when you're better. Don't worry about it now."

The next several months went with getting him back onto his feet, something a bit easier said than done. A few times, he did reopen some of the worse looking wounds when he got up to move around. The only upside to those moments was either Riki (an orange dragon-like creature known as a Charizard where he's from) or I were with him when it happened. His injuries managed to heal, leaving behind many scars across his body. He was able to cover them as long as the clothes he wore were long-sleeved shirts and pants with a high-collared coat. With those, the only scars visible were the two on the right side of his face (one over his eye and the other missing it; both parallel to each other).

A bit over a year ago, making it at least eighteen months since he had appeared here, Ren was given a way to go back to his home. When he had first told me this, I was convinced it meant he wouldn't ever come back. He must have been able to tell what I was thinking by what he said next.

"I'm not abandoning you guys, Yusei. I'd never forgive myself if I did that."

"But, what about-"

"I bet whoever I had been would really be pissed if I left behind friends that helped me when I was down. I'll come back here before and after my Gym battles. Besides, I'm sure a lot of my first partners wouldn't mind staying here and not being cooped up all the time."

Even with that arrangement, Ren had to keep his partners hidden and a bit out of range for Sector Security to find. They started following up on rumors of the "monsters" that were said to lurk about. While the ones who did know of Ren and his partners knew they meant no harm, his partners had to keep out of sight to avoid being caught. Though, even when Sector Security did get close enough to spot them, Ren's partners managed to evade them or lead them away from the others. Judging from how easily it came to them, I had to guess this wasn't the first time they had to do a risky game of hide and seek.

Over the next several months, Ren kept the promise of coming back, usually with more new partners, or the same partners but in new forms (which he called evolving). It was as he said, he'd come back before and after fighting in these Gym battles, showing the trinkets he won (badges). However, this wasn't the only reason he would return. Many times, he'd come back after having what I started calling flashback panic attacks. When he gets one, he freezes wherever he is (standing or sitting), eyes wide in fright like he's reliving whatever he's seeing right then and there. I couldn't get him to tell me what happened in them, and I was afraid to push the matter too much in case he had a relapse. In fact, the region of his world he was exploring caused him to have them more frequent.

"Maybe you should hold off going any further, Ren. If these visions get out of hand-"

"I can't do that. It wouldn't be fair to Emily and the others, especially to Emily. She's already had to wait, what, almost three years to travel the region I got her in. It'd be unfair to stop right when we're so close to completing it."

It was hard to argue with Ren on the subject. He saw his partners like family—probably the only family he could somewhat remember. Plus, he mentioned he had a good idea what could be triggering the memories and promised to avoid the trigger at all costs. That at least put my mind at ease during the days and nights he didn't come back. In the meantime, I had my own business to take care of. I had to focus on my goal as much as Ren had to focus on his.

Recently, he had left for a different region, one called Sinnoh is what he said. He had already finished the last Gym in the Unova region but was unable to face the final battles as it had to be put on hold due to an emergency. There was trouble with a crime organization that needed to be dealt with which meant putting any further challenges on pause. He figured he might as well start on the Gyms in another region while waiting. At least it would possibly mean he wouldn't have as many bad flashbacks hopefully, so maybe he could relax a bit from the stress.

Surprisingly, though, he decided not to have any of his previous partners travel with him. His reasoning was that he wanted to know he could deal with any problems without them, more to prove to himself than to others. He wanted to know that he could take care of himself without anything bad happen to him, or that he wanted to let any new partners know he could trust them to protect him when need be (he didn't know which one it was). It was obvious Riki didn't like the idea, even trying to follow Ren through his means of transport, but Ren managed to coax Riki to stay to watch the others.

Before he left, he gave me a way to contact him that seemed to work well when he was in his world. He gave it to me when I said he didn't have to come back after every Gym battle as he'd more than likely be a bit tired. There was only one contact in it which was his, so it wasn't that hard to figure out. It allowed for closure on both ends as Ren knew I was close to my goal. I could call him or vice versa should anything come up on either ends. With that, he left.

With everything that's happened now, though, it's never been more important to get in touch with him. If I don't, who knows what could happen?

A/N: So with that, the prologue is finished finally! Ugh, man, I feel like I've been teasing at this thing for the past few months on dA. Feels good to finally get it started, and just in time too. Who's hyped for Ultra Sun and Ultra Moon? Especially with what's been revealed already. All I have to say is...hurry up and get here already, November 17th!

PS- No worries, I'm not going to spoil anything for the upcoming games. I know some want to be kept spoiler-free and so I will not talk about what's been revealed as of late. Though, if anyone wants to talk about it, feel free to PM me on here or contact me on dA (I'm on a different username on there, so check my profile for the name; the link doesn't seem to work for anything outside of it seems :/).

PPS- I have other stories incoming, not just more Pokémon crossovers XD And I do intend on updating Amid Clan Disputes soon. I just get distracted a lot...and my mind wanders if I don't focus on it...