Where do I get a Sun Stone in Emerald?

Question

I need a Sun Stone to evolve my Gloom.

Answer 1

Non-repeatable
- Mossdeep Space Center (From a Sailor on the first floor)

Repeatable
- Held by wild Solrock (5%)

Sun Stone (Bulbapedia)

Comments

Is that the only place?

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Only other ways are to hope you run into a Solrock with one and use Trick or catch it holding one, or trade over other Pokemon holding it from other games.