01: Astonish - Ven can hide as a normal book and pop out to spook ya.
01: Withdraw - It’s a book, it snaps shut to defend. Both lv1 moves are shared with Applin, another cute Pokemon that pretends to be an inanimate object.
04: Poison Sting - Have you ever been stabbed with a pen?
08: Peck - If book is getting Drill Peck and BB, why not give it Peck for the baby levels?
12: Disable - The first KH spell reference. This lines up with Stop. Also nice spooky flavor.
16: Air Cutter - KH spell reference, lines up with Aero.
20: Gravity - KH spell. Literally just Gravity. Also funny with Cane/Gunk/Hypnosis.
24: Nasty Plot - Mandatory, Ven probably contains a nasty plot.
28: Mind Reader - The book reads you!
32: Drill Peck - Mandatory
36: Heal Pulse - KH spell, lines up with Cure.
40: Toxic - Mandatory
44: Roost - Mandatory
48: Sludge Bomb - Mandatory
52: Coil - Mandatory, i t w o r k s

56: Hurricane - Mandatory
TM10 Magical Leaf - It’s filled with magical leaves :)
TM14 Thunder Wave - Mandatory, lines up with KH's Thunder.
TM17 Light Screen, TM18 Reflect and TM19 Safeguard - KH spells. All three are Reflect.
TM20 Self-Destruct - Explosion was discussed and was considered inferior to BB, so I see no problem with adding a weaker ‘plosion. I mostly liked the visual of a book bursting into a whirlwind of pages and ink.
TM27 Icy Wind - KH spell, lines up with Blizzard (I didn't actually give it Blizzard to avoid bloat)
TM92 Mystical Fire - Mandatory, lines up with KH's Fire.