You have to beat the number 1 first with a single blow having the same attack power as it's HP then the number 2 will turn to number 1 and just keep doing it
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Buy it for 90 bugfrags from the bugfrag trader in the lower level of Yoka 1 in Blue. Press is required in the NaviCust for access. Buy it from a ghostnavi net-trader in Secret Area 2 in White.
Rank 10 is in HadesNet. Rank 9 is in HospComp 2 using the warp point in Beach 1. Rank 8 is in Undernet 3. Rank 7 is in PrincipalComp 2. Rank 3 is in Undernet 4. Rank 2 is in the DNN studio battle terminal. Rank 1 is technically in Secret Area 3, but don't worry about that.
battle tower
lock
Chip traders OR from volcano family viruses in the Undernet and Secret Areas that you S rank in Custom style with standard chips.