I LOVE "Radioactive"'s tune. It's really creepy and solemn, but also peaceful and melodic at the same time... and then when he starts to sing, the beat of the background drum really gives the song power
Plus, it utilizes a unique minor key to give the song zest and further eerie yet beautiful mysteriousness
I use EQ, since I changed Meloetta's HP Ice with HP Fire. Though, that makes her terribly weak to Dragons, but it's ok because Skarm handles that. Either way, EQ > Fire Punch because it hits Jirachi harder. Things like Ferrothorn, Skarmory, and Forretress are creamed by Meloetta anyway.
Thunderbolt over Psychic leaves Meloetta without STAB, which is bad... Maybe over U-turn though, since Meloetta gets forced out a lot by faster Pokemon. Not sure if it's worth the trade-off, but I'll have to try it.
Also, I was playing a bit more earlier and got pretty much wrecked by a Claydol/Cobalion/Ferro core in Rain, although I almost managed to win with DDMence (fuck confusion), bringing it from 1-5 to 0-2 O.o