My opinion of the Pika matchup has gotten worse lately, as he can abuse Mega's poor options of taking back stage control in conjunction with his ledge traps to exert ko pressure. Mega's too slow to punish spaced fsmash too, I think. He's also difficult to kill with anything that's not usmash or a high % throw. I used to think even because Mega won high % battles, but now I'm unsure.