One of the closest consulates of Montenegro for Egyptian citizens is in Moscow. The documents are accepted in person or by a notary's power of attorney. Visa is issued within 1-2 weeks.

If there are friends / relatives in Montenegro who have grounds for inviting citizens of other countries (residence permit, citizenship), then you can make an invitation for an Egyptian citizen. If there is no such right, then it is necessary to provide hotel and air tickets for visiting Montenegro.