How to find and use Rainbow Feathers and Silver Feathers in Pokémon Pokopia

Rainbow Feathers and Silver Feathers are mysterious items dropped by Ho-oh and Lugia in Pokémon Pokopia, and their use isn’t exactly clear in the early stages of the game. You can find these near-immediately if you’re lucky, but you’ll need to hold on to them for a while before you can actually use them.