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What is the なのは used in "なかでも にんき なのは ポケモンどうしを たたかわせて".
I know にんき is a na-adjective but i don't understand the use of なのは.
の is a noun with general reference. The na-adjective attributively modifies it. は is the topic marker. So you get 人気なのは "as for the thing that is popular".
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