5. Kolkata Knight Riders (KKR)

KKR has won 3 IPL titles (2012, 2014, 2024). They have made the Final of IPL four times and won three of those. If the results were reversed:
2012 Final: KKR beat Chennai Super Kings, so they would lose.
2014 Final: KKR beat Kings XI Punjab, so they would lose.
2021 Final: KKR lost to Chennai Super Kings, so they would win this title.
2024 Final: KKR beat Sunrisers Hyderabad, so they would lose.
Total IPL trophies for KKR in a reversed scenario: 1
4. Mumbai Indians (MI)

MI is one of the most successful franchises in IPL history, with 5 IPL titles. Mumbai have reached the Finals six times and won five of them, so if the finals were reversed, MI would have lost the 5 titles they won, so their count would drop to 1 trophy.
2013, 2015,
They suffered a defeat in the 2010 Final and they would have won that Final in a reversed scenario.
Total IPL trophies for MI in a reversed scenario: 1