You can't Golduck but you can get a Psyduck go in the safari zone and find the water toward the left use surf and move around the lake until Psyduck appears capture it train it to level 33 and now you have a Golduck.
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Yes, You can catch Groudon in Pokemon Emerald.
You can't catch one in Pokemon Emerald.
No you cannot catch Entei in Pokemon Emerald.
You can't catch a Bellsprot in Pokemon Emerald. You trade it from Pokemon Leafgreen!
There are many Pokemon you catch that are similar in sapphire and emerald but there are many Pokemon emerald can only get and not sapphire.