if you mean Grapple Voltage then you need to beat Gandrayda on the pirate homeworld
Ypu have to defeat the grapple beam boss found on dark torvus bog.
Yes samus is a girl. you can find that out by winning any of the following games: metroid, metroid 2, metroid prime, metroid prime 2, metroid prime 3, metroid zero mission and even more!
you could make some metroid prime or you can go to sprite resource.com
you find them
See the link below.
You can play Metroid Hunters online and if you have Halo for the PC you can download custom edition and then find the metroid prime patch. Google search "metroid online" for more info.
umm maybe ebay or if you use emulators you could google korean metroid prime rom hope i helped:)
In the Impact Crater on Tallon IV. He is the final boss.
at the end of brryyo when you jump from the 2 platforms turn into morph ball and thier's a rock behind you that you destroy while in morph ball annd these light up creatures will help you get to the other side then there's this thing that you ripp off,go through the door and their you'll find the grapple beam
You need to play WI-FI
you can find that and many others at Emuparadice.
In phazon mines. Keep heading in a straight path and you will find it.