Pick one! 6
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Talent (3) 50%
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Popularity (3) 50%
The term "Monster Rookie" was a title earned by the most talented new groups or soloists. I think the first Monster Rookie group was Shinee. The only soloist who were called Monster Rookie I remember is Son Seung-yeon.
Since 3rd gen the term changed completely, and now it's about "Charts, Sales, Overseas and overall popularity, and now it's overused.
So, my question is: Which version should be used today?
I think you can guess my answer. 
Some of the groups who were called Monster Rookies: Shinee, 2NE1, iKon, EXO, MAMAMOO, Blackpink, ITZY, i-dle, Babymonster etc.