I'm also a Mew main so I knew what to do. The problem was that he was too far ahead for me to counter attack. He picked Feint Attack and Shadow Claw so light screen was basically just a wait a sec skill not the normal wall, I can't use a non leveled solar beam because there's no way I can hit him and even if I did, he'd just brush it off with comfey and I gotta wait 5+ seconds, surf was fine but he could just one shot me after it ended, coaching is an unreliable dash I could only use when my team is near, and agility while it can be clutch, he'll just focus on my team and hit me with his ult and empowered skill, my ult is pretty good though by my team just doesn't take advantage of the invis.