Two ways:
1. Migrate one from Sapphire
2. Go to route 210(?) and you MUST HAVE a sapphire dual slot use pokeradar.
You don't, so sorry and you wont get on in there but if you do...
no Pokemon evolves into seviper
You can get seviper from Pokemon sapphire by trading.
Seviper is a Poison type pokemon.
Seviper does not evolve.
Using action replay get the capture trainer Pokemon cheat and then an ace trainer near stark mtn has one
Currently, seviper does not have an evolution.
there is a girl rear stark mountain who has one (its across a log thing where you use your bike)
you can't catch seviper on Pokemon ruby (Pokemon sapphire only)
Route 208
seviper can't be found anywhere
Route 208.Route 210, after obtaining National Pokedex, insert Sapphire GBA game into DS