Nincada evolves into Ninjask at level 20. If you have an empty slot in your party and an extra pokeball (a normal pokeball) Nincada will also evolve into Shedinja (It evolves into two Pokemon at once)
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You have to evolve Nincada. You can't catch it.
Level 30.
For Nosepass to evolve into a Probopass, it needs to level at Mt. Conoret, so you can't evolve them in HeartGold/SoulSilver, you'll have to trade it to Pearl/Diamond/Platinum.
level him up to level 55
You make it become friends with you, you should get Pokemon heartgold or soulsilver