I'd just keep Misty since even though at this point she had become a piece of moving background, I couldn't stand having Whitey or Casey cause the group dynamic was to me so close to perfect with Misty, it was tied with DP for best group dynamic.
1.The Anime: DP = OS > AG > XY > BW
2.The English Dub: 4Kids+Taj Productions (Seasons 1-5) = 4Kids Entertainment (Seasons 6-8) > DuArt Film and Video (Seasons 11-Current) > Taj Productions (Seasons 9-10)
3.The Games: XY = RS = HGSS > DPP > BW
4.The Manga: RBY = GSC = RSE
5.Pokémon: The Origin: Amazing: 9.5/10
6.The Movies: DP = OS = AG > BW
I'm a proud Advanceshipper, Pearlshipper, Pokéshipper, and Amourshipper.
My opinions are my opinions, you can't change it unless you're a good debater.