What were they using? I think it's basically impossible to get more than 1 or 2 on Ram without Alaz.
Ram you can get 3-4 on but I have no clue how to do the "Deplete Duel Bar" one without taking heavy losses.
I believe Ninja can do Trial 3 Easy since he brings Dec Def and Veil on himself, plus combined with Lydia you've got Trial 1 Easy and Trial 1 Normal set. Trial 2 Easy is a bit of a gatekeeper tho, since it requires Inc Acc and to get that in you need to be REALLY careful who you bring.
Sadly I got Dark Kael and Supreme Kael confused but if anyone is lucky enough to have Supreme Kael then you are really set for the Inc Acc, Dec Res, Weaken and Poison damage covered right there