Against lulu, In team fights, try to catch Lulu out of position or lock her down with CC. If you can take her down first, her ability to protect her carries will be lessened. If you can’t kill her, you might be able to force herself to self-cast her Ultimate R.

For AD champions, invest in an Executioner's Calling when Lulu and her team is ahead. This will reduce her healing and shielding capability on her allies.

Forcing team fights when Lulu’s Ultimate R is on cooldown is the best way to win fights as she will be unable to protect herself or her allies. Against lulu, In team fights, try to catch Lulu out of position or lock her up with CC. If you can shoot her first, her ability to protect her portages will be diminished. If you can't kill her, you might be able to force yourself to launch her Ultimate R. For AD champions, invest in the call of an executor when Lulu and her team are ahead. This will reduce her ability to heal and protect her allies.