Help with diana's quest line and campfire help

how do i continue diana’s quest line after getting manaphy? and what do i need to do with the campfire at holon forest?

Go to your dream world. Then go meet her in front of Selene Gym.

The campfire in holon needs you to drop a strength boulder on it. They can be found to the left or to the south.

it doesnt work… do i need to do something in the dream world?

Did you get Darkrai yet? Get it.

i got manaphy its just that i was told that i can continue after it to get cresselia

It’s a roaming pokemon.

oh thx