ScraftyDevil
Banned
RSE rival theme is my favorite, too, and it's mostly due to that opening riff that Beyonce's music producers probably ripped off later. B/W's is the next best, though, and it's by Ichinose too.
The R/S/E Rival Theme, along with the Deoxys theme (which is my second favourite theme in the series), the Regi Trio motif, the Elite Four theme and the Slateport City music, are the songs in which the samples they chose really worked to the song's benefit. They just instill the songs with a sense of either whimsy, urgency or danger, depending on how they're used.