After you beat Flannery, laveridge town's gym leader, right when you get out of the gym, your neighbor will talk to you and then give it to you.
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After you get the go-goggles, you have to go and beat your dad at his gym. :3
You get the go-goggles from your rival after you defeat Flannery.
If you go to this website here they sell the goggles that are in Pokemon. http://www.gogglesandglasses.com/index.html
You need to get the go-go goggles.
You get them after defeating your rival.