West: Suns, Wolves, Lakers, Blazers, Mavs, Sonics/Thunder*, Grizz, Nuggets, Kings, Jazz, Pelicans (Hornets at the time), Clippers, Warriors = 13
(interesting that the Rockers & Spurs never met in the playoffs while Duncan played)
East: Knicks, Nets, Pistons, Cavs, Heat = 5
TOTAL = 18
MJ's teams defeated:
West: Lakers, Blazers, Suns, Sonics/Thunder*, Jazz = 5
East: Cavs, Knicks, Bucks, Sixers, Pistons, Heat, Hawks, Hornets ('95 comeback), Magic, Wizards (Bullets at the time), Nets, Pacers = 12
TOTAL = 17
Shaq's teams defeated:
West: Blazers, Sonics/Thunder*, Rockets, Kings, Suns, Spurs, Wolves, Mavs = 8
East: Celtics, Bulls, Pacers, Pistons, Hawks, Sixers, Nets, Wizards, Knicks ('11 Celtics Shaq who played 12 minutes

TOTAL = 17
Kobe's teams defeated:
West: Blazers, Sonics/Thunder*, Rockets, Kings, Suns, Spurs, Wolves, Nuggets, Jazz, Pelicans (Hornets at the time) = 10
East: Pacers, Sixers, Nets, Magic, Celtics = 5
TOTAL = 15
Kareem's teams defeated:
West: Warriors (San Francisco & Golden State), Lakers, Bulls, Nuggets, Suns, Sonics/Thunder*, Spurs, Blazers, Kings (Kansas City), Mavs, Jazz = 11
East: Sixers, Bullets/Wizards**, Celtics, Pistons, = 4
TOTAL = 15
*depends if you count the Sonics and Thunder as one franchise - I did.
**depends how you count the Baltimore Bullets, Washington Bullets and Washington Wizards