In emerald :

[MaCiLLa]

where to find a moon stone so i can evolve my skitty?

[cool rayquaza]

you can only get it in meteor falls

[Dilop]

Lunatone drops Moon Stones, and they are located in Meteor Falls.

[Dark Charizard]

Lunatone drops Moon Stones, and they are located in Meteor Falls.

They hold it I belive not drop it.

[EderFranco]

Lunatone drops Moon Stones, and they are located in Meteor Falls.
but they r not in emerlad...

[Primal Link]

You would have to trade from Sapphire or xd to get Lunatone and anyway you get one in the first chamber of metor falls.

[Lugialord]

One is found in Meteor Falls, to the far left, not up the waterfall and there is a poke'ball with 'Moon Stone' in it.