It isn't in Emerald at all.Sorry.
You can find it in shoal cave during low tide.
You can't find a snowrunt in pokemon black and white.
You can find snowrunt on the way to snowpoint city. It can only be found at night.
you cant
You cant find one in emerald BUT... you can trade from FireRed/LeafGreen
you cant get reggiggas in Pokemon emerald
you cant
you cant
shoal cave, but it is very rare
you cant
If you mean Snowrunt, all you have to do is go into Shoal Cave and get to the very end, it's an icy room with an elevated section. Walk around the elevated section until you find it.
if you see it one time but it got avay go to pokedex and click locate. if you havnot find it you can find it random in voods. i find it in water.