In St. John Cassian's work "On the Incarnation: Against Nestorius" he claims that Pelagius believed
that Jesus Christ had lived as a mere man without any stain of sin, they actually went so far as to declare that men could also be without sin if they liked. ... They added as well that our Lord and Saviour became the Christ after His Baptism, and God after His Resurrection."
On the Incarnation of the Lord Book I Chapter III. Page 552 or 553 of the second series of Nicene and Post Nicene Fathers.
The author of this answer (https://christianity.stackexchange.com/a/52958/27623) takes issue with that claim. Is this actually what Pelagius himself, or Pelagians in general believed?
It seems logical that the patristic teaching of the incarnation implicitly teaches an indwelling of grace in mankind brought about by the union of God and Man within the person of Jesus Christ and therefore this is something that the Pelagians want to deny, so they explain that Jesus Christ was simply a man that through his own will and efforts obtained the indwelling of God (sort of like a Christian version of Nietzsche's super-man) and is gracious to us by giving an example.