xD Tile inserting was something I learned waaay back. But I'd rather not do that because :
a) I have problems of my own and limited time since I recently got an offload of work
b) I don't really like tile inserting since it's a bore.
c) I'm losing knots in hacking altogether, and am becoming a Pixel Art type of person
Even if I use X and Y pokemons, I would not really need you because I am only using the legends(The starters don't have a evo and YAPE only allows five evolutions for a pokemon). The Yveltal sprite was actually a request from DarkRisingGirl for DR2. She also requested kinataki for Xerneas sprite. kinataki have not finished the sprite yet so the only thing you can do is, correct the Yveltal sprite a bit.