You can find it where the navi who gives you c slider. Which you need an unclocker for ( The navi is in Sharo area where all the arrows are)
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http://tartarus.rpgclassics.com/mmbn4/walkthrough23a.shtml
The area in the Hospital comp. accesible through the beach area Id say the hospital.
You can find a "Black Bomb Z" in "Sharo Area" in the Space Center computer. When you're in Sharo Area, look for an orange girl, Navi, she'll be near a purple locked data. Use an unlocker, and then you'll have your Black Bomb Z.
yes, if you have battle network 4 red sun or blue moon (PAL or USA version) and you have a EXE 4.5 battlechip gate you can play operation battle, there for you must have Navi Chips (only released like exe 4.5 in Japan, or you can buy them on Ebay) and battle chips.
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.