Also I haven't really been reading this thread so I'm not sure about what's been said before like today. But here are some things about both character's specials.
Lucas PK Freeze - Pit can mirror shield it if it hits the shield. If it hits Pit then it'll freeze him.
Lucas PK Fire - Generally safe implying it's just being used only for attacking purposes. Can also hit Pit out of WoI.
Lucas PK Thunder - Can be reflected by Angel Ring and Mirror Shield. The head gets cancelled out by WoI, but it can hit Pit out of WoI after the starting push. Hits Pit out of glide, the head can be cancelled out by glide attack.
Lucas PSI Magnet - Magnet Cancelling arrows, other technical stuff that nobody ever does.
Lucas PK Thunder 2 - Can be reflected by Pit's Mirror Shield. Generally not a safe recovery option.
Pit arrows - Can be used to gimp Lucas. (Hit Lucas or hit his PKT to cancel it). Can also be used effectively if not mindlessly spammed or telegraphed.
Pit Angel Ring - Reflects Lucas's projectiles. Lucas can hit Pit out of it with Fsmash if Pit doesn't end it in time.
Pit Mirror Shield - Can be used to reflect projectiles and Lucas's PK Thunder 2 recovery.
Pit WoI - Cancels out the head of Lucas's PK Thunder. Lucas can hit Pit out of it with Bair, PK Fire, or PK Thunder if Pit rides up alongside the stage to make it to the ledge, or just about anything if Pit recovers outwards. If Pit recovers high, he can be hit out of WoI with Zap Jump, or use PK Thunder and punish the airdodge.
Pit gimping Lucas:
-WoI pushes Lucas away from his PK Thunder.
-WoI cancels out Lucas's PK Thunder.
-Mirror shield reflects Lucas's PK Thunder 2.
-Arrows cancel out PK Thunder.
-Arrows hit Lucas out of his double jump and he's forced to recover with PK Thunder, leading into a Mirror Shield gimp.
-Fair/Bair.
Lucas's Recovery Options:
-Double Jump.
-Airdodge.
-Zap Jump --> Magnet Pull.
-Zap Jump.
-Zair (mixing up the timings).
-Magnet Pull.
-Falling down low and wait for invincibility frames on the ledge to run out, then rising Nair.
Btw Lucas can't really do anything to Pits planking, and Pit can't really do anything to Lucas if Lucas just waits it out, so that's nothing to worry about. Just don't try to PK Thunder or Dsmash him if he's planking because it won't work and Pit will punish.