you sell items or do a lot of battles
EVEN better way: go back to littleroot town,go visit your mom after defeating your father,she will give you an amulet coin when you give it to a Pokemon and the Pokemon participates in any battle with trainers the money will double!!!
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yes
If it is Rival's Grovyle, evolve your starter a lot.
its not an emerald its RAYQUAZA the main legendary Pokemon in Pokemon emerald.
You cannot get a Yanma in Pokemon Emerald, as only Hoenn Region Pokemon can be found in Pokemon Emerald.
it give a lot of heath for not a lot of money