You can't.
Burmy is a generation 4 pokemon, it did not exist in games before Diamond and Pearl. It cannot be caught in earlier versions such as Emerald, even if you use a cheat device.
It cannot be traded to Emerald from the 4th generation games- trading from D/P to Emerald is impossible.
Therefore, it is impossible to obtain a Burmy in Pokemon Emerald.
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Burmy is a bug type Pokémon.
Trash Cloak Burmy is a Pokemon that can be won in level 20 of the game Pokemon. You need to battle two reporters in the Pokemon center in order to obtain him.
Sandy Cloak Burmy can be found in level 20 in Pokemon. This Pokemon has the shed skin ability that allows it to heal itself.
It is Burmy, in Sinnoh. You can find Burmy in honey-filled trees. It's uncommon there.
Take any type of Burmy and have it battle in a city or town like area.