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.
The universe in his show has a Multi to Multi+ structure. The universe is infinite in size and contains infinite parallel dimensions that are infinite universal in size as well:
https://vsbattles.fandom.com/wiki/User_blog:Firestorm808/Ben_10_-_Cosmology#The_Universe_(At_least_2-B,_Possibly_2-A_Parallel_Space-Times)
Had been repeatedly stated to have the greatest power in the franchise:
https://vsbattles.fandom.com/wiki/User_blog:Firestorm808/Ben_10_-_Alien_X_Feats,_Statements,_and_Scalings
Here's more info here as well:
https://docs.google.com/document/d/1AunMIWEP0A1ms__5Rcc9RMO0yrBKcRaCQbXF-KSydHA/edit
A sword made of his DNA can pierce through a higher-dimensional barrier:
Contumelia(a group of 5D beings) said it was extradimensional and "impossible" to cut through
His species are capable of changing the plot and artstyle of the show:
Existence contains at least 26D
The quantum mechanics and string theory also back up that statement