safari zone
no
Just catch the most Pokemon you can ;)
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.
you must have the national pokedex at search for it in the trall grass and catch it or trade it from firered or leafgreen
You can't catch or obtain other trainers Pokemon in emerald.
Cressilia is a 4th generation Pokemon so you can't catch it in Pokemon Emerald.
Yes, it is in Safari Zone (After you get the National Dex) and in Altering Cave.
After national dex you find it at altering cave its Levels: 20 +