Pokémon's Native World

A boy born in the Omu family in the Pokémon world has an unusual fate. What does the necklace that accompanied his birth and cannot be taken off, and the special ability represented by the power of Viridian, mean? (A slightly sweet Pokémon novel) Because I haven't watched Pokémon for a long time, but my hands are itchy and I want to write. There are a lot of plots that I can't remember. If I want to write something new, I'll just make it up, but the general route remains the same. Hope you don't complain