Replace Thundurus with Gengar so you can trap the opponent as well as taunting it. Like KRLW said earlier, Solgaleo doesn't need morning sun. Replace it with zen headbutt to cover fighting. Give Yveltal 4 HP/252 SpA/252 Spe timid to outspeed more stuff. Replace roost and psychic with u-turn to reduce the need to predict switches and foul play to hit strong physical attackers. Replace Marshadow's rock slide with bulk up to raise physical attack. Give Zygarde a leftovers so it can be used more than once and 252 HP/252 Def/4 SpD so it can survive using rest. Replace extreme speed and dragon dance with glare to slow down opponents and dragon tail to prevent stuff from setting up. Give Genesect a choice scarf to outspeed more stuff and 252 Atk/4 SpA/252 Spe hasty to take advantage of its bigger physical movepool. Replace techno blast, bug buzz, and psychic with u-turn to not get choice locked, iron head for STAB, and explosion to one-shot most things.
