You probably should have gone to the Trading Boards for one.
Getting a replacement Yveltal shouldn't be difficult, though. Back in the Pre-Bank Age of XY, I used to trade Unown of rare letters for countless Xerneas/Yveltal, which I then traded for Bank Legendarys.
FC; 2964 8693 8509 IGN: Verylin TSV: 1874 Lucid Dreamer's log for 2014: 40/365; Nightmares: 20. #MegaMadokaMagicaMaster of Serebii.Net.
everyone in the gts is a dirty liar, use it only for pokedex completion
I once found a shiny giratina asking for a bonsly...
That might have been me! :D
I was rushing to finish my living dex about a week ago, and didn't want to be bothered with baby mons and stone evos (Shiny, Moon, Sun, and Dawn). So I essentially gave away some of my shiny pokémon for dex filler. Fastest GTS offers yet!
Come follow me on my egglocke! http://www.gamefaqs.com/boards/2000300-pokemon-emerald-social/69876471