Is it wrong or illicit to go to a different diocese to be confirmed? Does an Ordinary have the right to confirm his subjects? Does the Bishop of another diocese have to have permission to confirm someone from another diocese?
Background: neighbouring diocese wants two year program of prep, leading to candidates being even 18 years old, etc. (A Lutheran idea of Confirmation?)
It is not wrong.
Can. 886 of the Code of Canon Law for the Latin Church states,
“A bishop in his own diocese may lawfully administer the sacrament of confirmation even to the faithful who are not his subjects, unless there is an express prohibition by their own Ordinary.”
Can. 887 adds that a priest who has the faculty to confirm, does so lawfully “even to those from outside the territory, unless there is a prohibition by their own Ordinary.”
Some people who might be interested in this topic are those traditionally-minded people who desire confirmation according to the older, traditional Roman Rite. While their local bishop may not be cooperative, the bishop of the neighboring diocese may be friendly and helpful.
Also, may I add my opinion that it is better to be confirmed by a bishop? Someone confirmed by a priest is not less confirmed, but it is seemly and fitting and, frankly, more impressive to be confirmed by a bishop.