Theo Ketchum,Oak's Ranch,

Late morning light spilled into the lab from the wide bay windows, casting a golden sheen over the desks and monitors. The hum of machines and quiet chatter filled the space, along with the occasional click of a Poké Ball being placed into a reader for analysis.

In the middle of it all, Theo, now seven, stood on a stool beside one of the larger workbenches, arms deep in a sorting tray of gathered Pokémon hair and feathers. His eyes were narrowed in focus, expression calm. Meticulous.

"Sorted by preening pattern, not just feather structure," he murmured, placing a Staraptor plume in a separate tray. "You can tell which ones were adapted for thermoregulation and which for gliding."

Across the lab, two of Professor Oak's assistants exchanged glances.

"He's seven," one whispered.

"I know. I still triple-check my labels," the other replied.

Oak, standing nearby with a steaming mug in hand, didn't look up from his notes. "That's because Theo reads the Pokémon, not just the papers. You lot could take a page from him."

Theo didn't smile at the praise, but his ears turned a bit pink.

From the side of the lab, a Meowth curled lazily in the sun. An Electabuzz blinked at Theo before walking away, unbothered. Pokémon that were typically cautious near strangers hovered near him like he was furniture—or perhaps something even more familiar.

"You're going to spoil the entire lab," Oak muttered as he approached the workbench. "Even the Pokémon like you more than they like us."

Theo tilted his head, thoughtful. "They just don't like being watched the wrong way. They act strange when they feel like they're being studied, but if you just notice them without making it weird, they open up."

Oak blinked. "That's a surprisingly accurate summary of fieldwork psychology."

Theo shrugged as if it were obvious.

Oak leaned closer, his voice dropping just a touch. "I've been thinking about that comment you made. About compatibility being more about comfort and familiarity than appearance. Can you explain that a little more?"

Theo hesitated, his hands pausing over the sorting tray.

"…Some Pokémon pair better not because they look the same," he said slowly, "but because they move or behave in ways that feel familiar. Like they share a type of instinct. Kind of like… categories that we haven't given names to yet."

"Categories?" Oak's brow lifted.

Theo glanced up at him, considering how much to say.

"Maybe not physical," he added cautiously. "More like… matching rhythms. Like water-dwellers that breathe similarly, or Pokémon that rely on scent or sound instead of vision. It's not just who they are, it's how they connect."

Oak straightened slowly, the gears clearly turning.

He's on the verge of it, Theo thought. Just a nudge more…

"You think we're classifying them the wrong way," Oak muttered, almost to himself. "That we're grouping by biology, when we should be grouping by… shared sensory or behavioral instincts."

Theo gave a small, noncommittal smile. "Something like that."

Just then, one of the younger assistants strolled by with a clipboard, grinning. "You might as well hand him a lab coat already, Professor. He's more precise than I am."

"Yeah, what do we call him now?" another joked. "Mini Oak? Or—oh! Little Prof?"

Theo rolled his eyes with a maturity that made the lab burst into quiet laughter.

From the entrance, a familiar voice cut through the bustle.

"Excuse me, have any of you seen my child, or has he been poached by the regional authority?"

Delia Ketchum, rounded with the gentle swell of late pregnancy, walked into the lab with a hand on her hip and a teasing spark in her eye.

Oak smiled innocently. "You say poached, I say mentored."

Delia raised an eyebrow. "He was supposed to be cleaning out the Chansey nesting area. And now I find him elbow-deep in a sorting tray and lecturing grown scientists about behavioral bonding."

"He's quite persuasive," Oak said. "And very hard to distract when he's on a thread."

Theo offered a faint shrug. "They were doing it wrong."

Delia turned back to Oak. "At this rate, you'll have him publishing papers by the time he's ten."

"I wouldn't mind," Oak said, not entirely joking.

Delia rolled her eyes, but her smile was soft. She walked over to ruffle Theo's hair—something he only tolerated from her—and whispered, "Just don't forget to be a kid every once in a while, okay?"

Theo looked up at her, quiet, thoughtful. "I don't think I'm very good at that part."

Delia's smile faltered just a bit. "That's okay. You're good at plenty of other things."

From the corner, one of the assistants muttered again, "Little Prof."

Oak took a long sip from his mug and looked down at the boy—still sorting, still watching, still noticing.

He's not just going to be part of this lab, Oak thought. He might reshape it.

And Theo, though he didn't say it aloud, already knew he would.

Oak,Oak's Ranch,

"Compatibility logs?" Theo asked, setting down a shallow tray of freshly cleaned Poké Balls on the long lab counter.

Professor Oak looked up from his clipboard. "Yes. The latest batch from the ranch. We've been testing possible pairings with the Rapidash, but no progress yet. Stubborn pair."

Theo tapped his chin. "Did you try the Zebstrika again?"

Oak blinked. "Zebstrika? They're completely different species."

"Not that different," Theo said mildly, already walking toward the whiteboard. "Both are herd-based. Similar body language. They run the same way—head low, short bursts of acceleration. You'd be surprised what similar instincts can do."

The assistants nearby paused.

Oak lowered his clipboard slowly. "You mean… behavior-driven compatibility again?"

Theo turned, bright-eyed. "I think a lot of bonds happen through recognition. Like Pokémon who share movement styles or courtship behaviors. It's less about species and more about… patterns."

Oak crossed his arms, thinking. "That would explain some of the weirder successes we've logged. A few outliers that didn't make any sense—until now."

Another assistant leaned over, scribbling the note. "You've got to admit, Professor, this kid's logic is airtight."

"Not bad for someone who still needs a booster seat at the lab benches," another joked.

Theo shot them a look. "I don't need it. It's just… convenient."

The second assistant grinned. "Sure thing, Little Prof."

Laughter bubbled through the lab.

Delia walked in just in time to hear the nickname, her shopping basket slung over her arm.

"Little Prof? That's what we're calling him now?" she asked with amusement. "Should I get it stitched into a lab coat? Or maybe a tiny cape?"

"Lab coat," Oak said, not missing a beat. "We'll save the cape for when he starts publishing."

Theo looked mildly scandalized. "Capes are impractical in fieldwork."

Delia laughed. "Spoken like someone who's thought about it way too much."

Oak pulled down a dry erase marker and began sketching a rough diagram on the board.

"Let's say we organize Pokémon not just by type or species," he began, "but by shared behavioral features. Nesting behavior. Preferred habitats. Mating displays. We could classify them based on this and track which ones are more likely to bond."

He paused, looking at Theo. "You're suggesting those categories are more important than visual traits."

Theo nodded carefully. "I think they're more accurate predictors. There's… a logic to it. Like unseen groups. Not perfect—but consistent."

Oak muttered under his breath. "Unseen groups… maybe that's what we've been missing all this time."

An assistant poked her head out from behind a stack of folders. "Should we start a new section in the compatibility database? Call it… Theo's Theory?"

Delia chuckled. "He's not a theory. He's a person. A very small, very bossy person."

"I'm not bossy," Theo said indignantly.

"You kind of are," Oak teased, ruffling his hair. "But only in a very professorial way."

Theo scowled and tried to smooth his hair back down. "I prefer efficient."

"Exactly what a Little Prof would say," an assistant said from across the room.

Delia leaned on the counter, her tone light but warm. "You do realize you've basically taken my child, right?"

Oak held up his hands, grinning. "I merely encouraged his natural interests."

"He's seven."

"He's exceptional."

"He still forgets to put socks on both feet."

"That's called asymmetrical design," Theo mumbled, avoiding eye contact.

Everyone laughed again, even Oak.

Delia shook her head fondly. "I swear, if you get him writing reports before he loses his baby teeth, I'm taking him back to the Chansey barn and making him clean nests for a month."

Theo blinked. "...Can I still bring my notebook?"

Oak nearly spit his coffee.

Delia threw up her hands. "Hopeless."

But as she looked around the lab—at the easy laughter, the Pokémon wandering freely, and her son at the heart of it all—there was no mistaking the pride in her eyes.

"Fine. Little Prof it is," she said.

Theo just adjusted his notepad like it was a badge of honor.

Oak,Oak's Ranch,

The holo-call shimmered to life in Professor Oak's office, where stacks of breeding notes and field reports cluttered the desk. The faces of Professor Elm and Professor Rowan appeared, framed by the flickering light of their own research stations.

Elm spoke first, eyes bright. "Sam, I've been looking into the breeding irregularities you mentioned. Compatibility doesn't follow types, or evolution lines. It's something… subtler."

Rowan nodded, his tone more reserved. "Indeed. I reviewed conservation logs from Sinnoh. Breeding patterns ignore traditional classifications. I believe we're looking at instinctual compatibility."

Oak steepled his fingers. "Exactly. Not a matter of biology as we understand it—but patterns of behavior. There's an unseen structure forming between Pokémon species."

Elm looked intrigued. "Behavioral families?"

Rowan added, "Social archetypes? Still doesn't explain Ditto."

Oak chuckled. "Let's leave Ditto for later. I think we can begin identifying clusters—shared instincts or behavioral similarities that lead to compatibility."

Elm leaned forward. "I've already begun rough categorization. For instance: Rhydon, Kangaskhan, Donphan—all ground-dwelling quadrupeds. That could be Field."

Rowan gestured to a list. "Here's one—Charizard, Dragonair, Altaria, and Salamence. Many aren't true dragons by taxonomy, but the pattern is undeniable: aggressive, ancient, flying or serpentine. Dragon Group."

Oak nodded. "And then there's this one—floating, often amorphous or spiritual forms: Grimer, Gastly, Solosis. They all share an unstable or malleable body composition."

Elm tilted his head. "Amorphous Group?"

Rowan hesitated. "Hmm… not quite scientific, but intuitive. Let's keep it."

They moved on. "Machoke, Mr. Mime, Gardevoir—humanoid frames, intelligent behavior, high emotional attunement…"

"Call it Human-Like, perhaps," Oak mused.

"Now wait," Elm interjected, eyeing the last name on the initial list left earlier . "What about Ditto?"

The room went still.

Rowan's eyes narrowed. "Ah. Yes. The wild card."

Oak sighed. "The one no group seems to contain."

From the side of the room, Theo, quiet until now, spoke up. His voice was soft, but carried clearly in the silence. "Maybe… that's because Ditto doesn't belong to a group."

All eyes turned.

Oak smiled. "You have a thought, Theo?"

Theo tilted his head. "Well… Ditto changes its form, right? But not its nature. Maybe… it's not about what it is, but what it isn't. Maybe it doesn't follow group behavior because it doesn't have any of its own."

Rowan stared, intrigued. "A blank slate."

Elm leaned in. "Or a placeholder for compatibility. A failsafe."

Theo nodded slowly. "Maybe it's the bridge—not the category."

Oak was quiet, eyes narrowing slightly. "That would explain why it can pair with so many Pokémon, but shows no preferences. It's neutral. Behaviorless. Adaptive."

Elm whistled. "A breeding constant."

Rowan murmured, "Fascinating. This boy thinks like someone who's done this before."

An assistant walking by quipped, "He's more 'prof' than half the researchers I trained under. You're gonna have to start paying him, Samuel."

Oak chuckled, and Delia, entering with tea in hand, rolled her eyes. "As long as he still remembers to eat lunch and not talk to notebooks for three hours straight."

Theo offered a small smile and returned to his sorting work, but not before glancing up at the model on the screen one last time.

Behind the researchers, Ditto's name now sat in its own column, apart from the rest. No longer a misfit—now a keystone.

Oak,

Pallet Town basked in a rare moment of quiet. The sky blushed a soft orange, and the rolling fields around Professor Oak's ranch swayed gently in the breeze. Inside the lab, the usual clatter of data disks and distant Pokémon calls gave way to focused silence.

Professor Oak sat at his console, flanked by Rowan and Elm via dual holo-projections. Notes filled every visible inch of the workspace — field reports, compatibility charts, mating behavior logs, and Theo's carefully rewritten observation sheets.

"We're close," Rowan said, tapping a stylus against his chin. "We've charted fourteen distinct behavioral clusters. There are outliers, sure—but we have a model now."

Elm pointed to the shared screen. "What about calling them Egg Groups? Simple, intuitive."

Oak smiled. "Fits better than any of the jargon we've been throwing around."

A few moments passed in thoughtful silence. Then Oak murmured, "We'll need to publish. Proper peer review. This changes how the entire world thinks about breeding compatibility."

Rowan's eyes narrowed. "We should also credit the observational groundwork—especially those notes from your young assistant. What's his name again?"

Oak's fingers paused mid-typing.

"…Theo," he said simply. "He's… special. Curious beyond his years."

Elm grinned. "Kid's a sponge. Doesn't just listen—he connects ideas. I'd wager he'll be giving lectures before he gets his first starter."

Oak said nothing for a moment, watching a small screen nearby that showed live footage of the ranch. Theo was sitting cross-legged in the grass, surrounded by Pokémon. An aging Arcanine rested its head in his lap, while a young Natu hopped between his shoulders.

He wasn't instructing or leading — just present. And somehow, the Pokémon responded to that presence.

Back on the main screen, the final document flickered to life.

Preliminary Framework of Pokémon Breeding Compatibility (Egg Group Theory)

By Professors Samuel Oak, Elm, and Rowan

With Observational Contributions by Theo Ketchum

Oak stared at the name for a moment before silently nodding.

Later that afternoon, Oak stepped outside, the warmth of the sun sinking into his lab coat. Theo was sketching in a notebook, Arcanine's paw draped protectively over his leg.

"You've had quite a week, Theo."

The boy didn't look up. "You too, Professor."

Oak sat down beside him on the grass. "You've helped us see things we were too close to notice. Those insights—especially about Ditto—may have redefined how future generations understand Pokémon behavior."

Theo's pencil paused mid-sketch. "…I just said what made sense."

Oak looked at him, long and thoughtfully. "You've always had a gift for making things make sense. That's a rare kind of clarity, Theo. Especially for someone your age."

Theo's shoulders tensed slightly, then relaxed. "It's easier with Pokémon. They don't pretend to be something they're not."

Oak smiled. "You'd be surprised."

Theo finally looked up, meeting Oak's eyes. "I know."

There was a long pause.

From a distance, a few assistants called out, organizing habitats and prepping samples. One of them waved. "Hey! Little Prof! You forgot your bag!"

Theo groaned softly. "They won't stop calling me that, will they?"

Oak chuckled. "Not unless you ask them very nicely."

Theo stood and dusted himself off. "It's fine. I don't mind. Just… not ready for people to expect too much, yet."

Oak rose beside him. "That's the beauty of growing up, Theo. You don't have to prove anything all at once. Just keep being curious."

The two walked back toward the lab, the shadows stretching behind them. In the distance, the lights of Pallet Town began to flicker on one by one.

Inside, a theory that would shape the future of Pokémon research was being finalized — and beside it, a quiet boy with the heart of a scholar walked steadily toward a destiny no one fully understood yet.