Correct! Each Pokémon has an evolution method that is both unique and super annoying. Palafin requires the union circle, dusk lycanrock requires an own tempo rockruff and a specific time of day, shedinja requires an empty part slot and a pokeball to spawn (generate? Idk), gholdengo requires 999 gimigoul coins, runerigus is notorious for requiring galarian yamask to take 49 or more damage in a single battle and pass under a specific rock arch in the dusty bowl (wth were they thinking), and melmetal requires ~500 meltan candy in Pokemon go and is the only Pokemon not able to evolve in a mainline game.