You'd have to trade it from FireRed or LeafGreen.
Pokemon Emerald has a bunch of Pokemon, that are available to be caught! It's too many to list here.
It's Diglett not Digglet and I think in all the Pokemon games there's a Diglett xD
Go to Vermilion city. After that go to the east and you will see digglet's cave. You can get to digglet's cave only in Pokemon Red, Pokemon Blue, Pokemon Yellow, Pokemon Gold ans Silver , Pokemon Crystal , Pokemon Fire Red ans Pokemon Leaf Green,
DIGGLET......
you can't
I think it is Mew and the sihnoh Pokemon
not if you beat it or caught it
Go to serebii.net/pokedex-rs/ Ther you can see all Pokemon that can be caught or trade or wathever on emerald.
dugtrio and digglet
The Growlithe cannot be found in Pokemon Emerald but you can trade it fromPokemonFirered.growlithe cannot be caught in emerald, Sapphire or ruby. it must be traded from fire red
Qwilfish can't be caught in emerald trade one from firered or Pokemon colosseum to get one.
You cannot find Houndoom in Pokemon FireRed and will need to trade with Pokemon Emerald to get one. Houndoom itself can't be caught in Pokemon Emerald but it's pre-evolved form Houndour can be caught in the extended Safari Zone.