>Gen 5
Myth was gen 1,
Consul was gen 2,
Irys was intended to be gen 3 by herself,
Sana's butt hurt and she left so they took Irys and stuffed her into Consulrys, and then just decided to call it Promise which was Gen 4,
Then advent showed up and that was gen 5,
Justice is gen 6.

If you count the starsfgts gen 5 came earlier, but op specifically said hololive, so I can't add them into the mix since they're a different branch.Also no one really asked for 5 holostar en branches.

Anyway op is probably a faggot that refuses to acknowledge advent as gen 5 cause they hate Shiori or something.