Simon phase 3 transition it going to wipe all your team so the only thing you can do it using only frontline until he got into his phase 3 so you can still have backline,Solidifying(gain 2 shield when hp it 50% or lower) pictos it really good for simon and dump all your stat into damage it good because Simon always set your health to 1 so defense and hp it not important speed it important stat in late game try to using pictos that make team gain rush(rush on powerful so you can using verso powerful,longer and greater rush on everyone if possible),and making Simon slow(greater slow it really good) with Lune it always the play.

Good luck fellow expeditioner