Level 30.
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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.
You make it become friends with you, you should get Pokemon heartgold or soulsilver
You'll need a Shiny Stone to make Togetic evolve.
No only in diamond, pearl, platinum, heartgold, soulsilver, black and white will yanma evolve.
Magnemite evolves into Magneton starting at level 30.