Unfortunately, I can't really help you here.
As I've mentioned before these missions introduce a new level of difficulty to the game, but in the noticably wrong way.

Having anything other than a full team of rainbows means relying on luck to pass the stage, as 5* knights are so incredibly ineffective to these pests it's not even funny.
I'd understand it if, for example, building a full team of evade+counter girls (of any rarity) would be an answer to beating the stage, but that's clearly not the case here.

On the other side, I believe there was a discussion about it somewhere earlier in this topic, so maybe try going back to that. I don't know if it was for this specific mission though.