In Pokemon Emerald where do you get the hard stone?

You can't get a Hard Stone in Pokemon Emerald. It was introduced in Generation IV (Diamond, Pearl, and Platinum).

In Emerald, you can get the following evolution stones:

* Fire Stone: Found in the Fiery Path.

* Water Stone: Found in the Slateport City department store.

* Thunder Stone: Found in the Jagged Pass.

* Leaf Stone: Found in the Ever Grande City department store.

* Moon Stone: Found in the Route 119, behind the waterfall.

You can also find Dusk Stones in the Pokemon Mansion.

Keep in mind that you won't be able to use these stones on all Pokemon, as only certain species evolve through these methods.