In order for my strategy to work as I asked in my last question, I need to know how to find a Diglett or Dugtrio in B2/W2. Please tell me how to find it, thx.
According to Bulbapedia, you cannot find Diglett or Dugtrio in Black, White, Black 2 or White 2, so you'll have to transfer one over from a 4th gen game.
Source: http://bulbapedia.bulbagarden.net/wiki/Diglett_(Pokémon)