In the Kanto region (in Pokemon Heartgold and Soulsilver). He is the 8th gym leader and can be found on Cinnabar Island (I think that's how you spell it). But to battle him, you must first get all the other badges first.
Battle of the Blue was created in 2007.
Battle of the Blue Trophy was created in 2007.
Battle of Blue Waters happened in 1362.
Battle of Blue Springs happened on 1863-10-10.
Battle of Blue Licks happened on 1782-08-19.
Battle of Little Blue River happened on 1864-10-21.
who's blue. Whatever here's how you have to get 7 gym badges in kanto then he'll battle you.
Blue
Yes.
battle Gary aka blue
In the viridian city gym.
blue is his fav bc on the battle of thames he stole his blue croc cham