Not every rare Pokemon is a legendary. Some normal-looking species have absurdly low spawn rates, making them harder to find than some Mythicals. Here are the rarest non-legendary Pokemon ever.
Feebas
Feebas is the rarest Pokemon in Gen 3. In Ruby/Sapphire, it only spawned in six specific tiles of Route 119, and those tiles changed daily. Even standing on the right tile gave only a 50% encounter rate — and your rod had to be a Super Rod. Catching one took hours of Dowsing Machine hunting.
Chansey
In Gen 1, Chansey had a 1% spawn rate in Safari Zone tall grass. Even catching it was a nightmare because Safari Balls couldn\'t be aimed strategically. Chansey eggs (and later Happiny) remain one of the most annoying grinds in the series.
Dratini
Classic Kanto Safari Zone spawn with a 5% rate. You needed to fish with a Super Rod in very specific water tiles. Generation 1 players know the pain — most of us grew up thinking Dragonite was mythological.
Riolu
In Gen 4, Riolu only appeared in Iron Island as a 5% encounter. Evolving it requires maxed Friendship during daytime, adding another layer of difficulty.
Spiritomb
Spiritomb in Gen 4 required 32 different NPCs talked to on the underground communication system before it would appear at the Hallowed Tower. Without online friends, this was nearly impossible.
Pokeworld Rarity
In Pokeworld, rarity tiers are explicitly shown (common/uncommon/rare/epic/legendary). Rare and Epic Pokemon require Rare Radars or Elite Zone access to find consistently.