If they ever bring Ash back, I hope they remix JOKER again, but in the style of the original version. It was just so lively and vibrant. The original sounds more 'Ash' than this one.
Sarali Colulita! His song is "The Second Joker" though. The normal "Joker" theme is essentially the entire team's theme, since they all share the trait of ambiguous morality, and the joker card in a poker game can be anything because it will become whatever will give you the best hand possible and what it is can change depending on all other cards in your hand.