After a short moment of Zeriel being with Professor Oak, Oak leaded Zeriel to be with other Pokemon to train.
Zeriel: "And the Rare Candies?"
Oak: "Oh, don't worry. We have plenty of Rare Candies. But how do you know about Rare Candies?"
Zeriel: "... The same way I know about you."
Oak hesitated, but quickly started laughing.
Oak: "Oh, so you also know about me? Well, I'm glad even Pokemon know about me."
Zeriel: "... I wouldn't if I was you."
Oak: "Oh, and why is that? Now you have me curious, Zeriel?"
Zeriel hesitated, but then slowly lifted his right hand and pointed at Oak.
Zeriel: "... I know what you did."
Oak: "... About what? I did many things until now. Is any exact discovery I did in the past?"
Zeriel: "Mewtwo. I know what you did, using Mew for experiments and create Mewtwo. Create a genetic Pokemon with all gens of all, synthesizing it to have more for control and as a weapon. I know your past link with Giovanni, Oak."
Oak hesitated, his breath steady, his heart palpitating, and he started to sweat. Zeriel remained dead serious and expressionless.
Zeriel: "But listen closely. I don't really care about others, so this is you and me. I know you're the real villain here, I have no doubts of so. But I want a deal."
Oak: "... A deal? Sorry, but I don't do deals with Pokemon."
Zeriel: "Of course... You hold them hostage against their will, and then give them to random kids, despite the actual danger, right? Good job, granny. Now, I'm serious, and so you should too."
Oak hesitated, sweating more, but after a few seconds, he suddenly made Zeriel go back to his Pokeball, adn then started running. Zeriel inside the Pokeball hesitated, crossing his arms and thinking.
After a short moment, Oak tries to get rid of Zeriel, using his laboratory to cause the accidental death of Zeriel. As a moment passed and oak was preparing, Zeriel suddenly got out of the Pokeball, and remained with crossed arms.
Zeriel: "... Don't bother, you won't. You have either, option a and accept, option b and die. No matter what you try, I win either way. The variant here is... You want to win?"
Oak hesitated, almost panicking, but then he slowly moved back and opened a drawer and got out few Rare Candies.
Oak: "Here! take them! But I become your trainer."
Zeriel hesitated while holding with both hands the Rare Candies, and after a short moment he slowly lifted his head to look at Oak.
Zeriel: "Oak, I'll be straight. I'm a Pokemon, and I want this just for strength. I want to get rid of that Pokeball. I'm fucking done for with that bullshit. You either get rid of it, or I own myself. Or you help me, or you die."
Oak hesitated and started looking around while thinking, and then he looked at Zeriel's Pokeball. He was wondering and analyzing.
Zeriel: "Oh, one thing... Could you imagine a Pokemon trainer owning Pokemon? Maybe... Just maybe... I go and own Mewtwo and Mew... And who knows, maybe I can... take them back to you."
After a short moment where Oak was going dizzy and feeling his head also palpating, he then decided to give Zeriel his Pokeball. Zeriel hesitated for a second before slowly moving his left hand and grabbing his Pokeball.
Zeriel: "I guess... Is a deal. Alright then, granny. I know you have more of what you can offer, so... How if we go straight to the point? I deal myself with myself and you help me improve with being a Pokemon to be stronger. And I help you hide your secrets, and become more famous. So... Wanna start with doing an entry for me in the Pokedex, granny?"
Oak hesitated, and without any word, he got out his Pokedex, and moved to be at Zeriel's right side. Zeriel hesitated, but then Oak leaded Zeriel to study him and determine the information to be added in the Pokedex.
After few hours, both hesitated and observed the entry.
Zeriel: "Is that much?"
Oak: "You surpass every Pokemon, legendary and any other Pokemon. And if I remember well, then you also surpass Mew and Mewtwo together with ease."
Zeriel: "A... Cool."
Zeriel then ate another Rare Candy.
Zeriel: "I fucking hate beinf so fucking small..."
Oak: "Maybe you can evolve."
Zeriel: "... Meh, sure. But now."
Zeriel then moved his left hand to hold his Pokeball with both hands, adn then hesitated for a few seconds, but then he started to crash it with both hands, and after a short moment, he slowly crashed it more and more by compressing it by raw force, adn when managed to destroy the Pokeball, flames went out of his palms and hands for an instant.
Zeriel: "Still, I want the customized Pokeball tho. In case of anything, at least I have the right to decide who I go with. Like for example... Gary."
Oak: "Don't add Gary in this."
Zeriel: "Relax, I actually like him. Is a good trainer who trains with effort and not with shit friendship. If I had to give the Pokeball to someone, Gary has a lot of chances, so in the end. You would have a close connection to me and could manage me more, don't you think, granny?"
Oak hesitated and remained silent while wondering.
Zeriel: "Oh, wait I remembered. Red, your created human trainer. In actual terms, he is the perfect trainer for me. And besides, he makes you closer to me, as you technically own him, what would make you technically own me."
Oak hesitated, looking side eye at Zeriel.
Oak: "How about this, Zeriel? I make you a Pokeball customized as you want, but you give it to Ash. I have planned Gary to remain as the Pokemon Champion of Kanto, and there are many other Regions. I know how Ash is, and I know he will want to travel, and you will make him possible of capturing all Pokemon registered, and register the new ones he finds."
Zeriel: "Alright... What do I get? I don't like friendship shit."
Oak: "... You'll have granted special things. I know about biology and Pokemon, you know I created Mewtwo using Mew. How about I use you to make you guaranteed of evolving?"
Zeriel: "... From a possibility to a guaranteed of being capable of evolving... You won't do anything and then lock me somehow in some kind of way, right? Because no matter what you do, I'll destroy all in my way and kill you then."
Oak: "You can trust me. You know what I can do, as you seem to know about Mewtwo. Come with me, and I'll make you capable of unlocking something further you could imagine."
Oak started walking away, Zeriel hesitated for a few seconds, but then Zeriel jumped down and started following Oak.
After a while, Oak leaded Zeriel to a more secret and abandoned laboratory, and then guided Zeriel in what to do.
Zeriel hesitated in entering a tube, but the constant words of being the only way of oak finished making Zeriel enter depsite his struggles. The tube closed behind Zeriel, and then Oak started analyzing anatomically Zeriel's DNA.
Oak hesitated, as for some reason, it was blocked in a way technology couldn't identify.
Oak hesitated for few seconds while observing, but then decided to save Zeriel's DNA for later deeper research, to then work on it.
The experiment slowly made Zeriel become more and more a real Pokemon, and oak observed how more statistics appeared on a monitor in front of him, showing more information about Zeriel and new being generated.
Oak hesitated, as he got an idea, but wondered if could work, but then decided to bring some things he got delivered. After a big while, Oak came back holding a Mega Stone and some Max Soup.
After a moment, the experiment ended, having synthesized the Mega Stone and the Max Soup in Zeriel. Oak observed the data, observing a conclusion of evolutions unlocked, an unlocked Mega Evolution, and granted capability of the Gigantamax form.
Oak then opened the tube. Zeriel was dizzy and barely capable of walking, and so he fainted and fell down, while Oak saved the data.
After few hours, Zeriel work up, and looked around, noticing he was back in the main laboratory of Oak. He then noticed Oak talking through a machine to someone, but he was still dizzy and barely capable of seeing well, and when reached to see something, the call ended, and Oak turned around and noticed Zeriel being awake. Then Oak moved towards Zeriel.
Oak: "Oh, you're finally awake. I must say, I'm fascinated with you and the results, but I also have bad news too."
Zeriel: "Huh?... I just woke up, and I feel like I'm drunk. What now, granny?"
Oak: "You see... You cna now evolve, and go beyond with powers that belong in other Regions and are unknown to the rest of the Regions. But sadly, you can't just access them like nothing, you have requirements, and even then... The data showed a danger as... The environment of every region affecting the experiment and you, and..."
Zeriel: "... I didn't understand shit. Tell right away."
Oak: "... To evolve, you need to become stronger. You can now Mega Evolve, but need a Mega Stone, and a bond with a trainer. To unlock the Gigantamax form, you need a special bond with a trainer. And this bonds are not near just getting along, but actual bonds that goes more than friendship."
Zeriel hesitated, still completely dizzy, and so his head started moving slowly around while felt his head was spinning, and then he fell back.
Zeriel: "Uhh... Give me some... Uhh, was... Meh, Vino tinto. Or whatever you have."
Oak: "The best for you is to rest, not drink."
Zeriel: "Yeah, sure, whatever..."
Zeriel then closed his eye sockets and fell asleep.
In the morning of the next day, Zeriel got awake by being licked by an Eevee. He hesitated, humming tired and clearly bothered, but he moves his head to his left while tries to grab the Eevee.
The Eevee quickly moves back and jumps over him playfully, jumping on his stomach and then in the space between his legs. Zeriel panted for a short moment before moving up and sit down.
Eevee: "Eevee!"
Zeriel: "... Yours just in case...
Eevee: "Eev? Vee!"
Zeriel: "... Yeah, whatever..."
Eevee: "Eev! Eevee!!"
The Eevee got excited, and then started jumping around for a short moment, before jumping down. Zeriel hesitated for a few seconds, before moving to get down, but when was to jump down, he suddnely got dizzy and confused, and almost fell down but managed to get down and still standing, but remained T-posing for a short moment while confused.
Zeriel: "... Even without a brain... I still get like that when I rush to get up? The fuck??"
Eevee: "Vee! Evee, Eev!"
Zeriel: "Yeah, yeah. I heard you the first time... But who knows what shit you said..."
Zeriel then followed Eevee for quite a while, until he is leaded back deep in the laboratory, finding Oak organizing things. Eevee ran towards Oak, and thena round him. Oak after a second noticed Eevee and kneeled down to grab and hug Eevee.
Zeriel: "So, granny? What ya doing?"
Oak: "Oh, good morning, Zeriel. How are you feeling?"
Zeriel: "... Get to the point."
Oak: "Still impatient... Well, I prepared the things for your customized Pokeball."
Oak then slowly turned around while Eevee was over the back of his shoulders.
Zeriel: "... Sure... Also, what was that call of yesterday?"
Oak: "Oh, it was nothing. Just a quick call to Ash. We just talked about a quick report, and situation. Just telling him about being your new trainer as was the best idea, and other few things."
Zeriel: "... Great... You mean the weird kid with hat and a yellow rat?"
Oak: "No need to be like that, that's very rude-"
Zeriel: "Yes or not, granny?"
Oak: "... Yes, that's Ash Ketchum."
Zeriel: "... Yeah... I... I know, but... I kinda forgot somehow... Bruh, I still feel drunk... The fuck did you exactly to yesterday?"
Oak: "You do? How do you feel exactly?"
Zeriel: "Well... I feel dizzy, and... Uhm... I feel my head spinning... Uhhh... Yeah, that."
Oak: "... Are you alright?"
Zeriel: "Yeah, I guess. Is just... just... uhm..."
Oak: "... Zeriel?"
Zeriel: "Eh? Yeah?"
Oak: "Are you feeling alright?"
Zeriel: "Uhh, yeah...?"
Oak: "... Well... I had planned to do your customized Pokeball now, and then bring you to Ash, so you could continue your journey. But it seems the experiment of yesterday affected you more than I knew."
Zeriel: "... Uh huh..."
Oak: "Go to rest, Zeriel. We'll do later your Pokeball."
Zeriel: "Ugh... Can I have some Rare Candies at least?"
Oak: "Why that obsession for the Rare Candies? I am aware they make Pokemon stronger, but... You're kinda obsessed."
Zeriel: "Yeah, well. Everything is addictive. They taste good, and make me feel a flow within my veins and heart. Can you blame me tho?"
Oak: "Well... How about this? You take a good rest, then train so you can handle Rare Candies better. How that sounds?"
Zeriel: "Wait... Are you saying that, maybe, I can't handle Rare Candies and I'm feeling kinda sick because of them?"
Oak: "... No, but now that you point it like that... Maybe the experiment wasn't the only cause of your side effects... Maybe the Rare Candies affected you differently than I could have thought..."
Zeriel (Thought): "Bruh... Welp, maybe for becoming a Pokemon, I'm not entirely ready for Rare Candies, as are for Pokemon. Becoming doesn't mean that I really am, so... Maybe... I should really follow steps...? Maybe I need to train, make myself slowly-no, that's much effort. I prefer murder."
Oak: "Zeriel, are you listening?"
Zeriel: "Eh? Oh, yeah. What?"
Oak: "Alright... Go to rest already. You really need to rest, if you can't even have your mind focused."
Zeriel: "Well, what if I refuse?"
After a moment, Oak carried Zeriel on his hands by holding his armpits, while Zeriel tried to get down like an energized baby moving his arms and legs around.
Zeriel: "Put me down! This ain't fair. I hate being this fucking small!"
Oak: "Yeah, yeah. Is nap time for you."
Zeriel: "No! I don't have nap time! PUT ME DOWN!"
After a short moment, Oak reached a place where he placed Zeriel to lay down, and used Sleep Powder, making Zeriel fall asleep.
Oak hesitated, but then observed Zeriel for a short moment, and then took out his Pokedex and analyzed Zeriel, and for his surprise, the Pokedex obtained some basic information as Zeriel's Types, visual and other basic information as his height and weight.
Oak: "Still no luck... But is curious... He acts differently than I first saw him with Ash and his friends, but why he acted different with me? And those symptoms after the experiment?... Something is wrong here, but what could it be?"
Oak hesitated, but then he saved his Pokedex and went back to continue researching.