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I don't think there is one. Actually, it's either 1 of 2 things: 1.Dragon Radar is a Z item 2. This is a known fact but when a dragon ball is revealed (via destroying things on the map in story mode) it will flash orange on the radar if dragon radar is equipped if not already.
Collect all 7 Dragonballs, and wish for it. The easiest way to do this is to repeatitively fight General Tao, after you have the Dragon Radar.
You have to find them in places of interest with the dragon radar.It (The dragon radar) is usually found in west city.
you have to get all the 7 dragon balls which are shown in the radar, and then shenron will appear
best place is krillen vs yamcha tien all those characters insaiyen sage sometimes there are located at the maps, also during battle you have to smashed the buildings or anything that is breakable and check your radar, you should see a signal that there is a dragonball nearby.
go to namek and on the map u will see porguna as a dot go to him and get 3 wishes but u get 1 wish on earth if u go to shenron but i think if you get 1 wish it is a better 1 then on namek PS: Did you try working the shaft?
In story mode just keep breaking stuff until an orange circle appears on your radar.
they are all underground except for the first one. Get the dragon radar and go over the spot where they have spawned and dig. you can skip a dragon ball and it will appear on the next world. So if you skip three in a row. The world in the next one will have four dragon balls
If the dragon radar is real then that is saying that dragon balls are real which is supposedly found on the top of Mt Fuji but then again it all depends on if you believe they exist or not
Dragon Radar
You have to "dig" for them in story mode. Due to a lot of spaces, it helps to get the Dragon Radar. The dot marks where it is at, when the dot is in the middle of the Dragon Radar, you are on the right spot.
If you mean the PS2 game, you have to pick up the dragon radar with one of your characters. Then every turn the dragon radar will ping towards the spot where the dragon ball is. You have to move to the spot and then search it and you should find the dragon ball.