you have to beat the game first then you can evolve in the little chamber...unless you
already beat the game then i don't know

Finish the game then you will soon unlock the Luminous Cave.(Where you evolve).Then get a
Link Box(For Pokemon games that is trade),bring it to the Luminous Cave then give it up
for evolution.P.S.Only bring one player.

its not link box its link cable

i dont no

u need to beat rayqaza and then theres a cave in wishcash pond ... u go in there and... u
got it from there...

first beat rayquaza second find the cave and go alone third find a link box(only if u dont
have 1) Then go back and say u wanna evloe and give it the link box. then u r a machamp!