Rage does not boost Attack when a Substitute is hit. 
If a multi-hit move (Arm Thrust, Barrage, Bone Rush, Bonemerang, Bullet Seed, Comet Punch, Double Hit, Double Kick, Doubleslap, Fury Attack, Fury Swipes, Icicle Spear, Pin Missile, Rock Blast, Spike Cannon, Triple Kick and Twineedle) breaks the Substitute any successive hits will damage the Pokémon that was behind the Substitute. 
Substitute will block full-trapping moves (Block, Mean Look and Spider Web).
Substitute blocks both the confusion and the stat increase of Flatter and Swagger. 
Damage done to a Substitute cannot be reflected back by Counter, Mirror Coat or Metal Burst, nor can it be stored by Bide. 
False Swipe can break Substitutes. 
Substitute blocks the item removing effects of Covet, Knock Off and Thief. 
While user has a substitute, the damage from SmellingSalt against the user by other Pokémon doesn't increase if the user is paralyzed, and won't heal the user's paralysis if the attack is successful.
Substitute blocks Intimidate but all other abilities ignore Substitute. 
Fixed Momento's interaction with Substitute, needs tested.
Fixed Baton Pass / Arena Trap (Mean Look-type skills) functionality, for realsies this time. (r3075)
Fixed Substitute's interaction with secondary effects. Should prevent payday/thief/etc from having their secondary effects run from an attack that kills Substitute. (r3073)


Test Recycle completely.

Double check baton pass in general. Make sure it works properly with switching.
https://labs.dividedsol.com/public/index.php?path_info=projects/test-project/tasks/135

Test Cute Charm against 1HK0 and Against genderless pokemon.

Test the following Abilities:
Clear Body
Effect Spore
Flame Body
Poison Point
Rough Skin
Trace
Hyper Cutter
Keen Eye
Sticky Hold
Pure Power
Plus
Minus
White Smoke
Color Change