Unown locations are a mainstay of the Pokémon universe. Whether it’s writing on cave walls, or – well, mostly just writing on cave walls – the Symbol Pokémon (or ‘alphabet’ Pokémon) is there to literally spell things out for you.
Pokémon Legends Arceus is no different, with an Unown Dex of its own, and 26 letters – and two punctuation marks – to find to gain a completed Dex entry.
Source – eurogamer.net