its probably cause you don't have the national dex in emerald.
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.
Gold -because it is the only metal.
No you cannot get eevee in emerald, but you can get it in sapphire.
you can't only in emerald (and platinum, pearl, and diamond) after beating the elite 4 go to the safari zone. head west and walk in the grass
In emerald, you go in a special cave after beating the elite four, but for sapphire you need to trade from FR, LG, or emerald.
only when you get the national dex on Sapphire version
its probably cause you don't have the national dex in emerald.
Only on emerald after beating the elite4 can you get a houndour, However the only other possible way to get houndour is from Pokemon colosseum and trade it to firered then trade it to ruby or sapphire or emerald.
You cannot get all 202 Pokemon just on emerald because there are Pokemon that are only obtainable in either Sapphire or emerald, but when you trade on emerald it will update your pokedex to national mode.
you cant cause its the end of Pokemon sapphire. but the game Pokemon emerald has the whole battle frontier.
You can't catch Groudon in Sapphire. Groudon is avaible only in Ruby and Emerald.
Yes, but only by beating the game and migrating it from Pokémon FireRed, LeafGreen, Ruby, Sapphire, or Emerald.
trade it from ruby sapphire or emerald after getting the national pokedex.
No, it can only be found on emerald or ruby and Sapphire
from the fight area to the survival area and you may also migrate from ruby sapphire emerald migrate is to put Pokemon ruby sapphire emerald instead of the cover but you must put 6 Pokemon in the PC in ruby sapphire emerald then select in Pokemon platinum migrate from ruby or sapphire or emelard
you must talk to professor birch after beating the Pokemon league