Clefable.
Its hearing is so keen that it detects a pin dropping nearly 1,100 yards away. It hides the instant it senses a person approaching.
Transcript
0:00What if I told you one of the rarest Pokémon in Kanto isn't hiding from you because it's shy, and the real reason is written in its ears.
0:03Clefable is the one almost nobody has seen in the wild.
0:07The entries say it flees the moment it senses people coming, that it stays way up in the quiet mountains, and that it guards those mountains like they matter more than anything.
0:10For 30 years the fandom has read that one way.
0:14That it's timid, standoffish, and a rare spawn with an ATTITUDE.
0:17But then there's the entry about its hearing.
0:21Clefable can hear a pin drop from more than a thousand yards away.
0:24Half A MILE, it can hear a PIN drop!
0:28Think about what the world sounds like to something built like that.
0:31Every conversation in a town, at once.
0:35Every engine, every argument two streets over, every door, every dog.
0:38All of it, all the time, with nothing turned down.
0:42And then the Pokédex tells you where it makes its home, and suddenly the mountain isn't an attitude.
0:45The mountain is the only place quiet enough to think.
0:48So it goes up there, and it guards the quiet, and when it hears people coming, it leaves before they arrive, and the people go home and say Clefable doesn't like anybody.
0:52You know a Clefable.
0:55Heck, maybe you're one yourself.
0:59The friend who slips out of the party at nine and gets called anti-social.
1:02The one who winces at the loud restaurant and gets told to relax.
1:06And it's hard to explain to people that you weren't avoiding them.
1:09You could hear every single one of them at once, the words and the tone and every other sound, and there was nowhere in that room to turn it down.
1:13It didn't leave because it hated people.
1:16It left because it could hear all of them.
1:20So tell us your pin drop.
1:23The thing you can hear that nobody else in the room can, the sound, or the change in somebody's voice, or the mood before it happens.
1:27And if you moved to the mountains, say so, and where, because the other Clefable in this comment section are going to want to know where the quiet is.
An absolute unit of HP at 95.
Clefable's base stat total is 483. The shape of a stat spread tells you everything about a Pokémon's role. Tanks lean defense, sweepers lean speed and attack.