Firstly.
Broly vs Super Baby Vegeta 2
Janemba vs Omega Shenron
Super Saiyan 4 Goku vs Super Saiyan God Goku
Bills vs Omega Shenron
Ok, so before you comment or say "oh well this guys was after, or they took a stronger fusion". I know all the power levels and the 3 strongest overall on the list at Bills, Goku God and Janemba.
Janemba had 600, 000, 000 more power level than Omega, but he was killed by pure energy as he was pure evil. God greater that SS4 , Broly beats Baby, and Bills slaps Shenron anyday lol