Sorry to say, but Seviper doesn't evolve, ever, in any Pokemon game.
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no Pokemon evolves into seviper
I think you would get an F if you were quizzed on Pokémon. Why do you think it evolves into Seviper? Arbok does not evolve, and Seviper is just a whole different Pokémon. It's ok if you were confused because Jessie used to have an Arbok and she gave it up and got Seviper, and you thought that her Arbok had just evolved. Hope I helped! :)
The level at which Pupitar evolves into Tyranitar level 55.
Vanillite evolves into Vanillish at level 35, and Vanillish evolves into Vanilluxe at level 47.
You can find Seviper in Diamond, but you'll need Pokémon Sapphire as well. If you put Sapphire in the GBA slot, you can find Seviper at routes 208 and 210. It's rare and will be level 26 at route 210 and level 18 at route 208.