If you play Diamond or Pearl,I'd recommend using grass-type Pokemon or your toughest Pokemon.Hope I helped!
The Go-Go Goggles you win ater you beat the 4th gym leader
I believe that is after you've beaten the 4th Gym in Volcanoridge Town.
I used my INFERNAPE,MACHOMP,STARAVIA,SHINX,MIVREUS and my hapiny to beat the fourth gym leader on Pokemon pearl.
You have to defeat Erika.
she says wow you beat the 4th gym leader that's great if i remember it right
you need to beat the 4th Gym leader then chase a team galactica guy then Cynthia will give u a secret potion
you need to dfeat the 4th gym leader
You beat Chuck, the 4th gym leader, in Cianwood city. After you beat him, leave the gym. His wife will come up to you and give the HM to you.
well......you beat the 1st,2nd,3rd,4th,and 5th gym leaders
Go to laverigde town, and beat flannery, the 4th gym leader. Be sure to bring a water, ground, or rock Pokemon with you.
you do not see her any more you only will see her at celestic town after you beat crasher wake the 4th gym leader
it depends on which gym because the 1st, 2nd, and maybe the 3rd they can beat the gym leader and if they have strong moves maybe even the 4th.