Today's random music in my head is me still not being over the remix of arrange of Unova's Battle! (Trainer) theme in SV Indigo Disc
I think it's neat that it kind of incorporates the Subway Trainer theme in a little with the drum beat and a few extra instruments at parts :3c
As a side note, the variation in the trainer music in the battle subway is honestly part of the reason I actually tried to do it in Black and White. I think it's the better version of the trainer battle theme (partly 'cus it sounds like you're on a train)
Oh and the PMEX ver is good too but that's a given tbh