It's Rainbow and Soarin's Chilldren XD

Base
https://www.deviantart.com/raini-bases/art/MLP-Base-3-488931927

DeviantArt-
https://www.deviantart.com/beikiart/art/MLP-Next-Gen-Rainbow-Wing-774843080?ga_submit_new=10%3A1543651513

Song
1. Daniel Ingram - I'll Fly (174UDSI Remix)