Need help continuing Pokémon emerald (ruby)

So far l've beat team magma on top of mt prye and have gotten the red orb from the old lady. When I go to the hidden magma spot where mt.chimney is the hidden spot doesn't reveal itself even tho I have the orb.

I’ve looked up tutorials on yt but still no luck

Any advice ?

So far l've beat team magma on top of mt prye and have gotten the red orb from the old lady. When I go to the hidden magma spot where mt.chimney is the hidden spot doesn't reveal itself even tho I have the orb.

I’ve looked up tutorials on yt but still no luck

Any advice ?