She doesn't freeze STTGL, she targets the pilots so they aren't able to operate STTGL anymore. Also to be clear by freezing I don't mean it's ice based or anything like that. I mean the pilots just find themselves no longer able to move. As far as I know, STTGL has physical controls that need to be operated for it to work.
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Pokemon VGC2011 NW Regional - Top 8
Pokemon VGC2011 US Nationals - 54th place