How can I Change Keldeo's Form in Pokémon Moon?

Question

I have a Keldeo in Pokémon Moon, and I don't know how I can get it to change to Relolute Form, I thought the one I have was already in Resolute Form, but it turned out to be just Ordinary Form. What I'm guessing I should do is delete Sacred Sword and then have Keldeo re-learn Secret Sword, but I don't know. Can I get some please?

Answer 1

You have to go to Hano Grand Resort in the hotel. There is a man with an Alolan Meowth standing there just waiting to teach moves to Mythical Pokemon. Ask him to teach Keldeo Secret Sword and your Keldeo should turn into it's Resolute Form.

Source: Experience and This.