Can you get Nosepass in Pokémon Ruby, Sapphire or Emerald?

Prepare, and buy some Poké balls. You will need to bring a Pokémon that has learned Rock Smash with you.

Go to Granite Cave, above Dewford Town, and go to B2F.

Use Rock Smash on all smashable rocks.

Encounter a Nosepass. Lower its HP, preferably to the red. Do not cause it to faint!

Inflict a status condition, such as Sleep or Paralysis, on the Nosepass.

Use your Poké Ball(s), and you should catch the Nosepass.