to get a hidden machine for Pokemon sapphire you have to..... ask someone else because i don't know
luck
Youuse it to find hidden items.
When the ruby and sapphire are recovered the Network machine can be repaired by Celio on One island. The Network Machine allows players to trade with Pokemon Emerald, Sapphire, Ruby, Coliseum, and Pokemon XD.
hidden machine
you have to have hidden power after you beat the elite four
fix the machine on island 1 find the ruby and the sapphire stones
Hidden Machine
keep looking its hidden
get both ruby and sapphire to the man next to the machine
strengh
beat the elite four and you'll know
that's how you find hidden items