Regarding the Houston Rockets in detail

Houston has won two NBA championships

 four Western Conference titles over the course of its history. 

Originally based in San Diego

 it was founded in 1967 as the San Diego Rockets, an expansion team.

The Rockets moved to Houston in 1971.

In their 1967 season of inception as a team, 

the Rockets managed just 15 victories

Four seasons in a row, in 1994 and 1995.