you can't.
Then you're only hope is trading for a Charmander.
You cannot find the Kanto Starter Pokémon as in Bulbasaur, Charmander and Squirtle in Pokémon Black, White, Black 2 and White 2 so you'll either have to arrange a trade with another player or you will have to transfer them from 1 of your older games.
How to find the captain on pokemon black2
No
in pokemon black and white
trade is required to get it on black 2
You can only find a Magma Stone in Pokemon Black 2, White 2, Pokemon Diamond, Pearl, and Platinum. It is not available in Pokemon Black and White.
Route 3 but I don't know we're 2 find it in black 2
If this is what you mean: Charmander evolves into Charmeleon at level 16 and into Charizard at level 36.
Gamestop
Deoxys cannot be found in Pokémon Black 2.
there has to be a pokemon outbreak for it to work, s/he is in route 2