Only if you choose it as your starter or use an AR.
You must train a bulbasaur to get venasaur.
No, you can only get one starter.
You must trade it from Pokemon firered or Pokemon leafgreen
No he is given to you at the start with the choice of 3 by that gay professor
You can only get those starters by either cheating, or by migrating from FireRed, or LeafGreen.
You'll have to transfer a Bulbasaur from a LeafGreen or FireRed using Pal Park.
There may be trainers that have ivysaur and bulbasaur and they might evolve and be a higher level after defeating powerful trainers or the other way is to get a bulbasaur as a starter pokemon.
yes you have to trade a egg or trade squirtle
nowhere you have to trade it from firered of leafgreen
Migrate one from firered or leafgreen.
it is bulbasaur ,squirtle, and charmender
up your bum