Because they like certain theme? I for one have played all Poke in games in my lifetime but I couldn't remember any of these. So I looked them all up and in the end I thought Gen 3 has the best. But for the most part it always ends up being Gen 3s music for me. It's really good.
I wish Blastoise was my dad. He wouldn't beat my mom like what her boyfriend, Johnny does. If Blastoise was my dad things would be different around here.