You must get the rock climb HM from professor oak after you beat blue.
you teach it to a Pokemon then you go to a scale and use rockclimb
use the pokegear
latious
Yes
You don't you have to use an Hm on a Pokemon
eevee
You have to use rockclimb
you get heracross or combees when you headbutt a tree
you can't, but in kanto you can use the radio
Use the Pokemon modifier AR code
I advise you to use your map.
Ecruteak