I know BW did Emotion first, but I just can't help but love An An Unwavering Heart. When I saw Ash won his first league that song just started playing in my head! I really wish he won Johto, Sinnoh and Kalos, but at least he finally obtained one after all those years.

https://www.youtube.com/watch?v=80863f0C2t0&t=929s