Just watch and listen! :) This is a remix of the original ultra necrozma battle theme (Remix if u want)
To pokemon Ultra sun/moon for the original theme Also to Glitchxcity for the actual music Here is the link to download the song (for free): https://soundcloud.com/glitchxcity/ultrasun-and-ultramoon-ultra-necrozma-battle-remix/s-FRBPk