Pokémon
Due to not being an official, League-registered, trainer, Lin's pokéballs are unregistered and carved from Apricorns. He does not buy pokéballs often, choosing only to purchase them from where ever he can find Apricorn balls when he intends to purposely go hunting for a new team mate, or already has a pokémon in mind.(Thank you to BlackFireKitsune for the sprites - Sprite Thread) 
Jeeves: Lin's best friend for a long time, Jeeves has been by his side since the Snivy, and his former trainer, 'Ruff', came across the boy. Jeeves was young when the two met, and he and Lin 'grew up' together. Jeeves has been the only 'snob' that Lin has had complete tolerance for; despite the Snivy's pompousness, Lin knows him better than Jeeves knows himself, and the same is true, perhaps to a greater extent, in reverse.
Victory in a pokémon battle shares a place with the taste of fried mixed-berry fritter for 'the best taste' in Jeeve's opinion, especially as both are things he can share with his, less refined, friend.
Jeeves considers himself to be dignified, talented beyond primitive 'power' or 'strength' in battle, and a pokémon worthy of admiration, though an over-show of indiscreet affection would be an embarrassment. He is, though, extremely loyal to Lin, and willing to put up with things that he might consider indignant, primitive, or even just silly, because they might make his friend happy. Lin has been the only one allowed to touch him since his former trainer, Ruff, was killed.
He shares Lin's aversion (and more rightfully, and naturally, so) to
fire, and also shares his hatred for Team Rocket.
The Snivy has no regrets, nor guilt, that Lin is his trainer, however Ruff had been the only person he had known from hatching, and had seemed as much a father to him as he had become to Lin.
Ball: Friend Ball
Current Moveset: Vine Whip,
Wrap,
Growth,
Leaf Tornado
Gregson: Gregson the Igglybuff is a clumsy creature, though perhaps he does not consider this to be too much of a problem. It was the Igglybuff's clumsiness, after all, that brought he and Lin together.
Lin had been eager to catch more pokémon following the visit that he and Jeeves had made to the fair and League announcement. He had seen so many trainers, heard of brand new places... All he and Jeeves really had were eachother, and Team Rocket were enough to justify a whole world of people, to his eyes, coming after them. With such thoughts in mind, he and Jeeves had set out into the forest around Sandalwood with a brand new batch of pokéballs.
"We've got 'im!" Lin had told his partner eagerly as the Weedle they were battling looked about ready to give up the fight. Jeeves didn't enjoy fighting bug types, either- they hurt- and so was eager to get the fight over with.
He stood back as Lin aimed, and threw, a pokéball toward the Weedle...
The odd Igglybuff had, through several events, found himself in the upper branches of one of the trees, and had promptly lost his balance, rolling down through the canopy.
With a terrified squawking squeak, the Igglybuff plummeted through the foliage, startling one human boy, one grass type, and one Weedle as he fell directly into the red beam that had been meant for the bug type.
Getting over his surprise quickly, the Weedle was quick to make its escape, while Lin puzzled over just what he'd caught.
"Damn it!" He exclaimed, upon looking up to see the bug type gone, but he had caught -something-.
It took two days before he learned what Gregson was, but only half an hour before he'd named the little creature.
Despite the circumstance of their meeting, Lin found himself rather pleased with this new acquaintance, though Jeeves certainly didn't seem to be.
Gregson is confident, but accident-prone; brave, yet aware of his small stature. He stands 'tall' and is quite proud, but in a different, swaggering style, compared to Jeeves' reserved nature. Lin, privately, thinks Gregson is absolutely adorable, and, even publicly, treats him gently, though still pretends catching him was a bit of a bother.
Ball: Level Ball
Current Moveset: Sing,
Charm,
Defense Curl,
Pound
Moriko: A calming influence on Lin's life, Moriko has been an acquaintance for a while, yet a team mate only since after Lin's trip to Camphoreon, and after Lin accidentally captured Gregson.
Moriko was a resident of the forest around Sandalwood, and one who would sometimes meet Lin and Jeeves.
Shy at first, the grass type gradually learned to tolerate, and then relax in, the company of the pair, especially as they occasionally shared what little food they had with her.
Lin began calling her Moriko, eventually, after his unsuccessful ventures toward the world of the university; it was a name he'd heard and remembered, as it meant something like 'child of the forest', so it seemed appropriate for their friend.
Eventually, after the League announcement fair, and the capture, and naming, of Gregson, Lin set out to persuade Moriko to travel with him as his pokémon.
The boy had an affinity for grass types, and thought a pokémon who knew him, and who he knew, could only be a benefit.
Moriko, with some persuasion from Jeeves, came willingly, though insisted on a short battle to see how Lin and the Snivy performed together.
The Sawsbuck was satisfied, and touched her nose against the offered pokéball at the end of the short battle.
Moriko is calm and collected; thoughtful but determined. She allows Lin to ride on her back with quiet pride, but always seems watchful and ready for battle even then. She and Jeeves respect each other, having been acquainted for quite some time and finding each others' dispositions agreeable, though Moriko may sometimes chide the Snivy for being too stiff and stuck up.
Ball: Friend Ball
Current Moveset: Tackle,
Camouflage,
Double Kick,
Leech Seed
Loro: This unusually coloured pokémon came into Lin's care after, at the insistence of Gregson, he acquired an egg during his taking part in a team with the goal of the destruction of a blackmarket organization; although the original goal had been to seek out Ray.
Loro, therefore, hatched with Lin and Jeeves both present, and immediately formed an attachment to the pair, and Lin's team.
She can be quiet and thoughtful, sometimes somewhat aloof-seeming, but she's hard working, determined to do well, and quite loving and loyal to those she's attached to. Her quiet, but determined, nature, and easy acceptance of most anyone has meant that even Jeeves tends to approve of her, though that may also be the bias of having been present for her hatching.
Ball: Friend Ball
Current Moveset: Tackle,
Growl,
Razor Leaf,
Poison Powder
Acorn: Acorn was bred in Kalos, destined to be a starter pokémon for some new trainer, however, when the breeding center she was born in suffered a breach in a storm, the little Chespin, curious by nature, found her way out. Pinwheel forest was her most immediate destination, though after several days, she found herself across the water from Castelia City. A ship caught her interest, and, accidentally, the little grass type became a stow-away, bound for Kodo.
She scavenged on deck and below, however, upon rounding the Southern coast of Kodo, and traveling up the East coast, she found herself in a squabble over a dropped croissant with a boisterous Wingull.
Acorn was knocked from the ship, and found herself washed ashore. Mountain passes, and the forest's edge... Acorn had a hard time surviving in the wild, eking by for weeks, barely, before, lost in the forest, she was drawn to the smell of food. The food belonged to Lin- or rather, it now belonged to Lin, though it hadn't that morning. Tentative, but hungry, the Chespin tried her luck and begged, keeping her distance at first. With a soft spot for grass types, though he had no idea what species she was, Lin continued to share the food he acquired whenever he saw the strange rodent. Eventually, Lin, Acorn, and all Lin's pokémon before to hang out constantly, as a group, though Lin has, in fact, not actually caught Acorn.
Ball: No Ball
Current Moveset: Tackle,
Growl,
Vine Whip,
Rollout
