I am purposely avoiding all highly detailed information on Black/White 2 so I can play my Nuzlocke blind.

Part of the fun of Nuzlocke for me is the challenge aspect. It's not fun to have to catch 10 Spearow or Fearows in a Nuzlocke, but it's just not challenging to Nuzlocke games for which I have detailed encounter charts that let me ensure I can catch a Houndour. So I have to balance my rules with other rules.