Let's say you had your last Pokemon to use Healing Wish.When it's done,you withdraw a fainted Pokemon and it's revived.Is this true?
Healing Wish can never revive a fainted Pokemon, and it will fail if used by the last Pokemon in a party. Source: http://bulbapedia.bulbagarden.net/wiki/Healing_Wish#Generation_IV
No not true.
Source: experience