Swellow

The crop is the pouch where a bird stores what it has just swallowed, and the official category—Swallow Pokémon—promises exactly that: a hunter that eats quickly without landing. Pokédex entries keep returning to the same scene. It spots prey from above, dives, grabs it with its talons and does not let it escape; one of them describes it plunging into the water after whatever is moving below. It lives in forests, even though its recorded habitat is grassland.

Away from hunting, it tends to its feathers. When two of them meet, each cleans the other's wings, and the split tail only stands firm when the animal is healthy, so its condition can be read from a distance without touching it.

19.8 kilograms at 70 centimetres is a lot of weight for a swallow-shaped silhouette, and that is the difference from Taillow: the smaller one is a flock bird, while this one hunts alone and from above. It closes out a two-stage line and has no alternate forms. No regional forms, no variants: there is only one Swellow, the usual one.

Its 125 Speed is the reason anyone looks at it. Everything else on its sheet falls short of what it needs: 85 Attack is merely adequate, 75 Special Attack does not get it anywhere, and 60 HP with 60 Defense and 50 Special Defense explain why almost any well-placed neutral hit takes it out of the game. Total: 455.

Guts is what holds the whole thing together. With a status condition, it raises Attack, and burn no longer cuts its power, so deliberately poisoning itself pays off. Facade supports the ability: it goes from 70 to 140 power as soon as it is statused, gets STAB and has no drawback. Brave Bird, 120, is the real Flying-type hit, with the expected recoil, while U-turn lets it sting something and leave before the opponent can answer.

What holds it back is predictable. Stealth Rock takes a quarter of its HP every time it enters the field, and with 60 HP that means two and a half switch-ins. Ghost types completely ignore its Normal-type attack unless it runs Scrappy, its Hidden Ability, which lets Quick Attack hit Gengar but takes up Guts's slot: it has to choose. And anything with priority knocks it out, because there is no margin left at half health. Smogon's National Dex lists it in RU. It is not even coded into Scarlet and Violet, so its current battles are in formats from earlier generations.

A single Egg Group, Flying, which pairs it with almost every bird in the Pokédex and not much else. The sex split is clean, 50% female, so any pair works and there is no need to bring in a Ditto to start a breeding line. Fifteen incubation cycles come to roughly 4080 steps, a fast hatch.

Its evolution has no unusual conditions: Taillow reaches level 22 and that is it. No item, no time of day, no friendship involved, even though its base friendship is 70. It grows at the Medium Slow rate, which delays the early levels a little and pays off later.

In Hoenn, it already appears evolved on Route 115, for anyone who would rather catch the finished version than breed the smaller one. Its catch rate, 45, is that of a difficult species: the same figure used by the starters, and with 125 Speed it rarely stays still long enough. Wild specimens can be holding a Charti Berry, which halves damage from a super-effective Rock-type move. Defeating it gives 2 Speed EVs, which is the only stat it distributes.