Jolteon

The habitat record places it in an urban area, which says more about how it appears than where it lives: it isn't a species you run into on a route, but what remains after bringing a Thunder Stone close to an Eevee. Its electricity comes from within. It has an organ housed in its lungs that generates current, and you can hear it crackle when it breathes. Its cells produce a low charge on their own; its fur, which the Pokédex describes as a set of electrically charged needles, multiplies it through static electricity until it becomes 10 000-volt lightning bolts. To power them, it gathers negative ions from the atmosphere.

The warning appears in several entries: when its fur stands on end, it's about to discharge, and you'd better move away, because lightning can strike all around it.

Its temperament is the other trait the Pokédex keeps emphasising. One entry states outright that it's difficult to get along with because of its high-strung nature, an unusual judgment in a Pokédex that usually describes its creatures in friendly terms. Its official category, the Lightning Pokémon, covers both halves of the creature.

It is 80 centimetres tall, weighs 24.5 kilograms and walks on four legs. Within the Eevee line, it was one of the first three destinations, alongside Vaporeon and Flareon, long before the list grew to nine. It has no alternate forms.

525 points distributed with a bias it doesn't hide: 130 Speed and 110 Special Attack out front, 95 Special Defense behind, and then the floor, with 65 HP, 65 Attack and 60 Defense. It hits first and hits hard on the special side; any reasonably serious physical attack takes it down.

Volt Absorb is what defines it. Electric-type attacks do nothing to it and even restore its HP, so it can switch in for free against almost any opponent that relies on Thunderbolt or Thunder Wave. Quick Feet, its hidden ability, raises its Speed while it has a status condition, but asking it to stay poisoned with 65 HP is a bad deal.

When attacking, pure Electric typing is comfortable and narrow at the same time: it punishes Water and Flying, does nothing special against the rest, and Ground types nullify it completely. Thunder, learned at level 50, has 110 power and accuracy that only rain can fix; Thunderbolt, obtained by TM, is the 90-power version that actually hits. Volt Switch, with 70 power, is probably its best resource, because with 130 Speed it almost always moves first and leaves the slot open for another Pokémon. Thunder Wave, learned at level 20, paralyses anything that would otherwise outspeed it.

What holds it back is its coverage. Outside its own type, it only has Shadow Ball and Alluring Voice, both at 80 power, as well as Tera Blast. The physical attacks it learns—Wild Charge at 90 power, Pin Missile at level 35 and Last Resort at 140—are wasted with 65 Attack. A Dugtrio cuts off its escape and is immune to everything it throws at it.

It belongs to a single Egg Group, Field, and its eggs never hatch into another one: they hatch an Eevee, and the stone comes afterwards. The gender ratio is seven males for every female, with 12.5% females, so starting your own breeding project means finding the female or resorting to a Ditto.

The 35 Egg Cycles work out at around 9180 steps, one of the longer stretches in the game. It doesn't provide any Egg Moves: everything it knows comes from levelling up or TMs, and it doesn't have any Move Tutor moves either.

The evolution condition leaves no room for interpretation. Use a Thunder Stone on an Eevee, with no minimum level, no time-of-day requirement and no friendship involved, unlike Espeon and Umbreon, which depend on the clock. There's a documented detail that often catches people by surprise: if the Eevee is paralysed when the stone is used, the paralysis survives the evolution.

Its recorded habitat is urban, and its catch rate, 45, corresponds to a species that is difficult to catch. In practice, it hardly matters, because almost nobody catches one. It grows at a medium rate and its base friendship is 70. Defeating it awards 2 Speed EVs, which fits the rest of its profile.