Originally Posted by Balkri

I imagine that high lvl players seek teams that can compensate something that they own teams lack.

In my case, only 2 of my teams are really "strong", so I mostly look for strong helpers to do what my knights can't do.

By the way, my helper squad is mostly an anti small pest teams with Toad Lily + Leucocoryne, but also have Cactace for sheer force and Orchid for speed... Dahlia have a -15% damage debuff for enemies, so is not bad for bosses.

Is that balanced? I don't know, but so far it works xD

Yeah I would say that is pretty balanced / all-round.
I can't speak for other high level players but I'm actually not looking for anything in helper squads, I'll pick the first helper squad with a power above 80k and 600+ speed and I'm good to go. if I'm trying to 3* a mission I'll just pick anything with the same speed as my squads which is roughly 520-550. When you reach a certain amount of power you don't really rely on the helper squad anymore.