Seviper is in the Safari Zone. Specifically, it is in the swamp area. In the swamp area, you have to put certain items or blocks to attract seviper.
Go to the Safari Zone and switch the Marshland in so you can go to it. Place 18 Plains objects and wait 10 days.
I suggest changing the time on your DS to 23:59, then starting your Soul Silver and waiting until the clock says 0:00, thus, it will be a new day. Then save and do it again ten times, then look for you Seviper. Don't change the date; it will change on it's own.
Or, if you don't want to do this, trade on the GTS or transfer from a GBA game.
Hope this helped.~
Of course not!
Seviper
No. Siviper is in Sapphire/Emerald
no you can trade soulsilver pokemon to black
The only way is the Pal Park.
At Safrai Zone
You can catch Seviper in Ruby, Sapphire, Emerald, HeartGold (IV), SoulSilver (IV), Black and White.
no Pokemon evolves into seviper
Seviper is a Poison type pokemon.
You can get seviper from Pokemon sapphire by trading.
Seviper does not evolve.
Currently, seviper does not have an evolution.
you can't catch seviper on Pokemon ruby (Pokemon sapphire only)
seviper can't be found anywhere
You need to trade seviper to firered from sapphire.
Of course not!
Seviper is #336 in the national pokedex, and it is a Poison type Pokemon.