As regards the diaconal ordination of those who intend to be enrolled in the secular clergy, the proper bishop is the bishop of the diocese in which the candidate has a domicile or the bishop of the diocese to which the candidate is determined to devote himself. As regards the presbyteral ordination of secular clerics, it is the bishop of the diocese in which the candidate was incardinated through the diaconate.
Source: Code of Canon Law (Vatican.va)