Well, Pope Pius V, in 1567, agreed that the sale of indulgences was offensive to God and they have been outlwed since.
With just a bit of research, you will find that the sale of indulgences was not outlawed by Pius V or any other pope, because the sale of indulgences was never a part of the Catholic faith. (The sale of spiritual authority, the misuse of tithes, the practice of hearing confessions, granting absolutions, or performing miracles for money, etc. is a sin under Canon Law: the sin of simony.) Some priests sold indulgences despite this, of course; eventually, Rome cracked down on this at the Council of Trent. All "contracts" between buyers and sellers of indulgences were annulled by Pius V.
Indulgences themselves have been and are part of the Deposit of Faith handed down to us via the Church from our Lord and His Apostles, and are taught by the Catechism to this day.
Myths about indulgences
Detailed information on indulgences