Need Cosby Show Season and episode name {or #] of Olivia episode.

Hello,
I want to make sure I buy the right Cosby DVD. There was an episode with Olivia sitting on the bed with with maybe Pam or Rudy[?]. They got into this little "Buddy" thing back and forth and it was one of the most precious scenes. It really showed little Raven's great acting talent. Any ideas of which season, episode [or number?].
Many thanks in advance,
Mike