This is the music that plays during the fight against Deoxys in Pokemon Emerald/FireRed/LeafGreen.
Ported by com_poser, it's not a 1:1 port of the original because pieces of it were slightly modified to be a little more interesting.
Fitting for any space related stages or any epic stages in general.
This is a good port, although I will admit, as a fan of this song, I'm a bit bummed that it's missing the blips in the intro. I think #3 is my only gripe. Notation is a little off, and the "Pulse.brr" is rather loud and kinda annoying. 4/5