I've always wondered about this,so I'm going to ask.If your enemy is frozen and you do a fire type damaging move,the Pokemon would heal its frozen status.If your enemy is burnt and you do a damaging water type move,could the Pokemon heal its status?
No, it is not possible to un-burn an opponent by using a water move. In RL, if you are burned, running water over it will soothe it, but the burn remains, the same applies to Pokemon.
No, you have to use items, But there are some moves that can eliminate burn which are Refresh Rest Heal bell Aromatherapy Psycho shift(this transfers its status to its opponent)