You get them after defeating your rival.
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You need to get the go-go goggles.
After you beat Flannery (GYM Leader in Lavaridge Town) your rival will give you Go Googles.
Obtain the Go-Goggles from May/Brenden in Lavaridge Town after you defeat the Gym Leader.
Steven will geve them to you as you leave fortree city
You have to go to Lavaridge Town and challenge Flannery, the gym leader. Once you defeat her, walk out of her gym and you will run into Professor Birch's son/daughter (your rival). He/she will give you the Go-Goggles. You can now go through the desert outside of Lavaridge Town.