I have two, and both are found in the original Japanese dub only.
The first is found a few rare times in Best Wishes, but being that they haven't announced an official BW soundtrack yet, I can't post it on here. It plays in the original dub of "Butterfree and Me!", when Ash has flashbacks about his Butterfree, and in the most recent episode, "Best Wishes! Until the Day We Meet Again!", right after Parker is rescued back on the boat and Iris is pointing out the Magikarp and Lapras. I hate how they changed the music in the English dub of the Butterfree episode, and I really hope they don't do it again for the dub of the one I just mentioned... -_-
The second was actually unreleased, and it's here:
This music also plays in the Japanese version of Misty's departure. It just has such a nostalgic, Kanto-y vibe to it, doesn't it?