At level 1, be careful of Pantheon's early pressure as he can often cheese a kill and force you to blow Summoner Spells or health potions.
Try and stay at max range at all times to make it harder for Pantheon to jump on to you and start a fight with his W.
Once Pantheon hits level 6, communicate with your team whenever Pantheon recalls or leaves lane as he may use his Ultimate R to roam and help another lane.
Watch out for a potential Flash engage by Pantheon. In team fights, don’t stand too far forward in case he tries to make a play.
Ward your flanks! Pantheon may try to attack you from the side and get on to your carries when his Ultimate R is on cooldown.
Using disengage tools or CC’ing Pantheon as soon as he engages will not only reduce his damage output, but it will help keep your allies alive and help you win the team fight.
Pantheon is very strong in the early game. Keep this in mind and be prepared for him to play aggressive and go for kills.
Once Pantheon is level 6, his kill pressure doesn’t increase much in lane, but his map and roam potential does thanks to his Ultimate R. As soon as he goes missing, make sure you communicate with your team as he may look to roam.
Once Pantheon completes his Boots, he will look to roam and help his other lanes out. Ping whenever he goes missing.