You can catch Growlithe early in Black/White 2 and get an Eevee by the 3rd gym. Also in that game, you can trade thru wi-fi after the 2nd gym for any pokemon you want. Dont like that Oshawatt? Trade it in for a Squirtle, I'm sure the trade boards would be willing to help you with that. Plus there are sites where you can automatically transfer pokemon to your wi-fi trading GTS in the game. Get B/W2 man, you'll be happy that you did.