The Whirl Cup was a Water Pokemon tournament stationed in the Whirl Islands. (it was between Olivine and Cianwood City if you didn't know/remember) It's a more realistic-looking archipelago, which looks like it was based off of Hawaii, than the ones in the games which look like 4 symmetrical islands. If I remember correctly, Misty placed in the top 8 and Ash placed in the top 16.