If the answer to the question, "What is in the pocket?" is "Nothing is in the
pocket." is the topic marker が needed after "Nothing" (i.e., "なにもが ..." or
just "なにも ...")?
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2016-03-13T01:06:08.607
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2016-03-13T08:40:18.520
2016-03-13T08:40:18.520
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question
particle-を particle-も
Use of particles for なにも in response to the question "What is in something?"
"なにも" Should suffice as a response, but of course this would heavily rely on
the context and flow of the conversation. You could play it safer by saying
"なにもない" which is a little more foolproof and natural sounding. Perhaps が could
be used in this more grammatically complete sense "なにもがない". Keep in mind how
polite you wish to speak ^^

I Hope this has answered your question. I know this is more of a comment, but
I do not have enough rep to just comment. Sorry
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2016-03-13T06:09:03.890
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2016-03-13T06:09:03.890
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answer
You'd say なにもない. なにもがない is incorrect.

The particle も replaces the subject particle が, as in:

  * 「なに **が** ある？ 」-- 「なに **も** ない。」 (×「なにもがない。」)   

  * 「なに **が** ありますか？ 」-- 「なに **も** ありません。」 (×「なにもがありません。」)   

  * 「[誰]{だれ} **が** いますか？」(Who's there?) -- 「誰 **も** いません。」(No one's there.) (×「誰もがいません。」)   

  * cf. りんご **が** あります。 / りんご **も** あります。(×りんごもが～)
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2016-03-13T07:01:50.650
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2016-03-13T08:29:44.967
2016-03-13T08:29:44.967
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answer