they were trained for years under the title 'pledis girlz'
https://www.youtube.com/watch?v=vA8l00ojhqc
most of them went on produce 101
2 of them made it into the final IOI group (pinky & nayoung)
they finally debuted as a proper group after IOI disbanded, called pristin. debut song was songofthecentruy
https://www.youtube.com/watch?v=wLfHuClrQdI
they followed that up with we like dudududududududdududu
https://www.youtube.com/watch?v=J6LAzgZi8N8
which was the last song as a full group (aug '17)
there was a subgroup called pristin v, in may '18
https://www.youtube.com/watch?v=-z3iyydFevQ
they had the comfiest vlive sessions ever
https://www.youtube.com/watch?v=Bg7BWGmzwXA
but for much of the past year they've gone very quiet, and for the past 3 months the only things they've released have been birthday videos, featuring just one member
don't think pristin have done any public appearances since early september
pinky is doing schedules in china
some people think it's a knock on effect of kyla effectively leaving (she started to chub up right after debut, then went on 'hiatus', she's clearly never coming back but pledis never announce things)
i think it's related to stone music/off the record though (the company that manage fromis9 & izone)
it started last year when the pledis ceo was put in charge of fromis9's debut
all of the resources to manage those groups has to have come from somewhere
i think it came from pledis, hence why they barely do anything now