The Superhero Database Classification number, or SHDB Class, is a number that represents the overall 'power' of a character. All traits of a character are used for calculating the Classification.
What it DOESN'T mean
This doesn't mean that a higher class would always beat a lower class character. But the bigger the difference in Class is, the more obvious it is who'll win in a fight.
How is this calculated
( INT^1.3 + (STR*0.5 )^2 + (SPE*0.5)^2 + DUR^1.6 + (POW + (SPS*SPL))^2 + COM^1.8 ) ^ TIER
Super Power Score and Level
Every Super Power has a score (SPS) that is used to calculate the Class. Each Super Power also has 3 levels (SPL). The level is set when connecting that Super Power to a character. The level determines the final score, of the Super Power, being used in the calculation.
Alien X is literally a God. He could make it so Green Lantern never existed. It'd be faster than him just Thanos dusting him in the death battle video
Feedback has absorbed the big bang
Clockwork can shoot time rays, which can infinitely age anyone shot with said time ray
Upchuck has literally eaten a very powerful bomb, with no damage after the bomb blowing up in him
XLR8 is most certainly too fast for GL. Fasttrack probably is too, but he's slower than XLR8
There is also the fact that, simply, Ben can't die. Whenever he's in danger, his watch will quickly go through all his aliens, picking the one that would prevent his death