all of them
The most improved team is the Lakers.
The least successful NHL team are the Columbus Bluejackets, in the NFL the Arizona Cardinals, in the MLB the Tampa Bay Rays, and in the NBA the Charlotte Bobcats.
Los Angeles Lakers
The Boston Celtics won the most NBA championships. They won 17 NBA Titles (
The Boston Celtics have won the most NBA Finals and thus the most NBA championships with 17.
The record for most made shots in a NBA carrer is Reggie Miller (USA) .