go to moutain Coronet and get him a level up then magneton evolves
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Capture one in the Safari Zone, and it should already be past the evolution level. Just raise it up one level, and it should evolve into Ariados.
To get a Salamence on SoulSilver, you need to catch a Bagon or Shelgon in the Safari Zone. You can catch Bagon in the Swamp area of the Safari Zone, or Shelgon in the Wetland area. Bagon will be level 45 when you catch him, and Shelgon will be level 46. Level up Bagon one more time, he will evolve into Shelgon, then level up Shelgon to level 50, and he will evolve into a Salamence.
Phanpy can be caught in the safari zone west of lilycove city and will evolve into donphan at level 25
catch a skorupi from pastoria city in the safari zone and evolve it to drapion. check the pokedex to see what level you can make it evolve and find it if my answer is wrong.
You can find Larvitar all over Mt. Silver and at the Day time in the Safari Zone mountain. The best Larvitar is placing 5 peak objects in the Safari Zone Mountain Zone. The Larvitar is level 42. This will evolve into Pupitar on it's next level up and into Tyranitar at level 55.