^ Although that may be true, people who don't have Medichan type PKMN...(Use a fighting type move, Super effective....Psychic type move, super effective...) It may be a good annoyer for those who don't.
If you only want one of them on your team pick Delcatty. Only for healing! Double Edge as it's attack. Wish, Aromatherapy(I think that is what it's called), Thunder Wave, Double Edge. Of course this only works well for me.
If you can have both in your team then have both. (Kecleon should get Trick/ Seismic toss/Flamethrower/ Shadow ball) At least that is what I put on it, and it works well for me. (Trick with Choice band)