Kingdra is an absolute monster in the rain and I knew that if I wanted a safe-route at winning this game, I would have to save him. Even if I KO'd his Politoed with Outrage, he would switch Gliscor in, which is 2HKO'd by Outrage, and by that time Perish Song would have killed Kingdra. I wanted to save him for later, to punish as many of his Pokemon as possible. Besides, Politoed and Gliscor are easy KOs, the former is 2HKOd by HJK and Psyshock and the latter is one-hitted by HP Ice and Ice Beam. Kingdra was needed for the other annoying rascals.
EDIT: I'd better incorporate this bit into the warstory. Thanks a bunch! :D
DOUBLE EDIT: Nvm, I have some major editing to do. I just remembered something crucial.
THIRD EDIT: It was not a sac, it was a misprediction. I just remembered and fixed it in the warstory already. Boy do I feel stupid. Now it makes more sense! Sorry for the inconvenience :( Hope the warstory is still worth your acclaim.