Requirements for Pope in Canon Law

[phil19034]

No, a layman can be directly ordained as a Bishop. He does not have to go through three rituals: deacon, priest, and then bishop.

There are three requirements for a valid Pope, as stated in UDG
w2.vatican.va/content/john-paul-ii/en/apost_constitutions/documents/hf_jp-ii_apc_22021996_universi-dominici-gregis.html

1. validly elected
2. ordained a bishop (either before or after election)
3. freely accepts his office as Pope

Three ordinations, no. But once ordained Bishop, the Bishop is also Priest and Deacon. The Bishop contains the fullness of ordination. So he receives the charisms of Deacon and Priest in addition to Bishop.

All Bishops are ordained Deacons and Priests too. Even if the rite is no different from a typical bishop ordination