I beat Girintia and it was sparkling and I didn't get the Pokemon! Am I glitched?
http://bulbapedia.bulbagarden.net/wiki/Pokémon_Rumble_Blast
It is supposed to tell everything about super rumble blast, but I don`t remember where it tells about the sparkle effect.
All I know is the sparkles only ups the chance of getting the Pokemon, but you don`t just get the Pokemon instantly. The chance of getting a legendary is still low.