@dy3p Hi, since your friend is in Australia already and if he decided to bring his wife later sa australia, he can apply for a visa subclass 802 and 801. 802 muna which is the temporary partner visa ang unang igragrant while prinorpocess yung 801 which is the permanent resident visa.
Your friend can read the requirements and more info here:
https://www.homeaffairs.gov.au/trav/visa-1/801-
some info if offshore or onshore ang magaapply:
https://www.homeaffairs.gov.au/trav/brin/part