easy to get it all you have to do is find it in i think the second gym grounds.
Pokemon Opal and Pokemon Onyx are not yet real Pokemon games.
A green onyx (if you are talking about pokemon) is a shiny and rare pokemon. tough I have never seen one
Geodude and Onyx
Onyx
its not an emerald its RAYQUAZA the main legendary Pokemon in Pokemon emerald.
rock tunnel
You cannot get a Yanma in Pokemon Emerald, as only Hoenn Region Pokemon can be found in Pokemon Emerald.
There is no PalPark in Pokemon Emerald.
Sinnoh Pokemon DO NOT EXIST IN EMERALD!!!
defog is not in emerald,
emerald no doubt
where do you get the spade from on Pokemon emerald