You know that guy on Cinabbar Island who looks like gary? He is blue. After you get the seventh gym badge talk to him and he will go back to the gym and you can fight him.
Outside the Power Plant after you defeat Gary/Blue.
Well after you defeat 15 gym leaders in Pokemon HeartGold / SoulSilver go to Cinnabar Island and talk to Blue.
after you defeat trainer blue, the last gym leader in kanto, talk to prof. oak. he will give it to you
there is no 16th gym in soulsilver u dope....
Impossible to get a blueorb in soulsilver
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After you defeat blue, go to victory road gate and go left. Professor Oak will appear and tells the guard to let you through.
Well first I should clear up that the Red Orb is for SoulSilver, and the Blue Orb is for HeartGold, but you must defeat Red in order to get it.
Blue can be found at Cinnabar Island. You have to defeat the other 7 Kanto gym leaders before you are able to battle him.
Nope!
in dragons den
defeat gym leader.