One of the conditions to gain plenary indulgence is usual to pray for the pope's intentions. What does that mean? According to the Raccolta the following are some of the Holy Father's intentions.
1. The progress of the Faith and triumph of the Church.
2. Peace and union among Christian Princes and Rulers.
3. The conversion of sinners.
4. The uprooting of heresy.
The Raccolta, 1910 Edition