You can use it anywhere as long as you use it on ground. you can also dig and make secret bases underground!
you use an explorer kit in any town and it already has tools
you cant get an explorer kit Pokemon Sapphire dosent use wi-fi you can get an explorers kit at Pokemon diamond, Pokemon pearl, Pokemon platinum and that's it :[]
You have to use the Explorer Kit and dig underground for the fossells.
Use the explorer kit any where. After you are underground, keep digging at the walls until you find a fossil, it may take a while.
use your explorer kit
you go to eterna city and go to the undergrownd mans house take to him and he will give you a explorer kit and use it!! ps.have fun!!!!!!!!!!
I'll give you one way but you need a explorer kit if you have the explorer kit use iit a go under ground. There you can meat people and set traps but before you go under ground it'll say conectting to wifi.
Underground use the Explorer Kit.
You first have to find them when you use the explorer kit and mine down there for shards.
You can find one with Cleffa or Clefairy (5% chance) or you can dig underground.
you get them (well for you the armor fossil) in the under ground. to get there just use the explorer kit that you got from the old guy from eterna. hope it helped :)))) queefer
You have to talk to 36 people under ground using the explorer kit and then go to Pokemon tower and there will be a little alter south of there and use the odd key stone on it and you'll battle it.