Blambeau is in rivet ravine tunnel 2 you have to keep looking for him your reward for beating him is 10,000g which can pay for lots of things. I hope my answer helped!
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The first time he is in Greenhorn Plains. Just follow the left wall. He is holding a gun. The second time he is in Rivet Ravine in Tunnel #2. All you need to do is defeat him in a Fossil Battle to capture him. The third time, he is in Mt. lavaflow. Go to Mt. lavaflow N.E and head straight, until you find a right turn. Take the right turn and he will be there
in the sea
coldfeet glacier
in the secret site.
in the rivet ravine pay to dig area