is this what I need to beat them? like what are easiest ways to rekt them.
For anything that isn't a Virus type, Lilithmon (2 is even better) with MAX INT is the best.
Phantom Pain from a MAX INT Lilithmon destroys things but they are easily killed so lots of revival items is recommended.
If it's a Data, just Phantom Pain with them, if it's Vaccine, have PlatNumemon (if it was raised from PlatinumSukamon) use Character Reversal and have Lilithmon use Phantom Pain after they have been bugged (if they can be bugged, some are resistant after all)
Keep reviving them as needed and they will easily kill most of them.
Once you beat UlforceVeedramon, GET HIM! His support skill is one of the best. (allows your party to go first, a BOOM for the other RKs and the Demon Lord DLC when we get it).
By the time you get to Crusadermon, you should be able to win even though the dmg will be neutral (no 2.0 bonus or anything) with Lilithmon.