Hi, i just won the fishing contest a couple hs ago and i got the msg that i can change the form of my keldeo but i dont know where to do it. Have a nice day.

Keldeo changes the form upon the fact having the move Secret Sword or not, so if you either get the move on it with the Sam Urai NPC at Matsuki Village or get rid of the move it will change its form.

@Norex i think you may missunderstood his question. Regard of his statement for winning fishing contest i think he wanted to know the way to change his Keldeo into themed form, not what aforementioned Resoluted form. Therefore, you can change it in the one and only house in Corsica according to what i know @Dualkey.

Thanks to bouth, i knew the thing about the resolute form already but still thanks. I was able to change its form once i take off secret sword and it was a regular keldeo; looks like you cant change it to xmas keldeo if it is the resolute form. Once again thanks ❤️