I haven't listened to them all, and I don't have the game, but man the Magikarp Festival track is amazing! It will get you pumped!
That it does! There's several tracks that would be home at a Poké Rave!
My absolute favourite is Tellur Town (Autumn)! I've just been listening to the extended version on repeat it is so awesome! Love me some fiddle!
I also love Ferrum Dojo, the music is so catchy but then there's the chanting bits that just make it! Regi Ruins is great for chanting too!
Dragon's Nest is just plain epic!