There is grass(or seaweed or something) on the ocean floor
No, only from emerald to silver, but i dont see why you have to, you have the region already there.
(After beating League)Go to route 104 and surf forward.There you will see a diving patch.Dive and you will see a cave,go in it.You will see the Legendary Kyogre.(Can be catched with Pokeball)
see me
there is no way to do that
booger
in the pokedex
somewhere
See related link.
No you just need to SEE all the Pokemon in emerald pokedex
when you see all the Pokemon in Pokemon emerald go back home and talk to professer birch. he will let you pick 1 of 3 very rare Pokemon.
navel rock
you can't