lol im with splash.
I used to think that if it was done by a magicarp in a water feild that it would do some special thing and kill all of the opponents pokemon lol.
I was 7 when i used to think that now i know that it dousnt. lol XD
All are fine and I wouldn't throw away any. Splash is for fun. Don't you see how funny it is when your pokemon uses it? I'm thinking only about game-playing because if you use it on wi-fi people will laugh or say "WTF". You will surprise them.