Super Transformation
Super Transformation has a max level of 20, so no book 30 exist. Super Transformation requires a quest from Kyrin to unlock this skill. The only skillbook for this skill is a bit of a farm because Blue Wyverns aren't too common, but it's very easy to get this skill book.

Here's a quick reference guide to unlocking Super Transformation:
Head over to Kyrin, 1st job instrutor and start the quest
You'll then be teleported to a special map where Super Kyrin will be spawned
In order to finish this quest, you'll need to survive getting hit by Super Kyrin for a brief amount of time. Super Kyrin only hits around 3,000 so just spam potions until the timer runs out.
Once you're done surviving, go back to Kyrin and Super Transformation will be unlocked




Demolition
Demolition requires a quest from Kyrin to unlock. This is one of the core skills of Buccaneers so be sure to unlock this early. The books are easy to get, but be aware that Cold Sharks cast slow on you and the Sharks in the same map can dispel you. This can lead to instant death for mages if you decide to use your mage to farm that book. Like most Buccaneer books, they shouldn't be too expensive nor uncommon in stores.

Here's a quick reference guide to unlocking Demolition:
Talk to Kyrin once you've unlocked Super Transformation and she'll send you on a quest to collect 50 Skins/Stone Hearts from Red Dragon Turtles
Once you've finished collecting, go back to Kyrin and you will unlock Demolition




Snatch
Snatch requires a quest from Kyrin to unlock. Unfortunately, Snatch books are only dropped by boss monsters. Luckily, Snatch is not one of the Buccaneers core skills so you can wait on getting these books whenever you have time to spare to dispatch of both Papulatus and Leviathan. Papulatus is often killed for XP and NX, so grabbing an Snatch 20 should be available often in the Free Market shops.

Here's a quick reference guide to unlocking Snatch:
Talk to Kyrin once you've unlocked Super Transformation and she'll send you on a quest to collect 50 Skins/Stone Hearts from Blue Dragon Turtles
Once you've finished collecting, go back to Kyrin and you will unlock Snatch



Time Leap
Time Leap requires a quest from Rolonay to unlock.

Here's a quick reference guide to unlocking Time Leap:
Talk to Rolonay in The Nautilus: Mid Floor - Hallway to start the quest
He will prompt you to defeat Papulatus for a silver key
Defeat Papulatus and he'll drop the silver key. Return to Rolonay
He'll tell you to head back to Papulatus and defeat him once again.
Defeat Papulatus once more and try entering the door to Papulatus again. You'll be teleported to a map with a Papulatus NPC
Keep talking to Papulatus and select the bottom option and he'll send you back to Natilus Port to talk to Rolonay
Speak to Rolonay once more and you'll unlock Time Leap




Battleship
Battleship requires a quest from Kyrin to unlock. Battleship only has a max of 10, so there is no skillbook 20/30 for Battleship. This skill should be left at 1 because anything higher and the cooldown time for the Battleship will go up with each level. The only thing that changes with each level up is the amount of defense the ship gets.

Here's a quick reference guide to unlocking Battleship:
Head over to Kyrin, 1st job instrutor and start the quest
You'll then be teleported to a special map where Super Kyrin will be spawned
In order to finish this quest, you'll need to survive getting hit by Super Kyrin for a brief amount of time. Super Kyrin only hits around 3,500 so just spam potions until the timer runs out.
Once you're done surviving, go back to Kyrin and Battleship will be unlocked




Battleship Cannon
Battelship Cannon requires a quest from Kyrin to unlock. This is the bacon and eggs of Corsairs. Books are relatively easy to farm because there are maps specifically just for those Wyverns as well as the mini bosses.

Here's a quick reference guide to unlocking Battleship Cannon:
Speak to Kyrin to start the quest
She'll ask you to kill 150 Spirit Vikings and collect 50 of a special Etc. Drop that they will drop upon starting this quest
After you've killed 150 Spirit Vikings and collect the 50 items, go back to Kyrin and you will unlock Battleship Cannon




Battleship Torpedo
Battleship Torpedo requires a quest from Kyrin to unlock. The books are easy to get, but since Red Dragon Turtles are hard to get in a group, you might struggle a bit with farming those. Since this is also a book dropped by a Skele monster, you can find them laying around in the Free Market from time to time.

Here's a quick reference guide to unlocking Battleship Torpedo:
Speak to Kyrin to start the quest
She'll ask you to kill 150 Gigantic Spirit Vikings and collect 50 of a special Etc. Drop that they will drop upon starting this quest
After you've killed 150 Gigantic Spirit Vikings and collect the 50 items, go back to Kyrin and you will unlock Battleship Torpedo




Hypnotize
Hypnotize requires a quest from Shulynch to unlock. Papulatus shouldn't be an issue for Corsairs once you have your core skills, but be prepared to fight several Papulatus. Papulatus is often killed for XP and NX, so grabbing a Hypnotize 20 should be available often in the Free Market shops.

Here's a quick reference guide to unlocking Hypnotize:
Talk to Shulynch in The Nautilus: Training Room
Pick the second option to be transported to a special area
There are three mini jump quests here which aren't too difficult.
Once you've completed the jump quest, click the NPC at the end and you'll be transported to a protection PQ much like El Nath PQ and Henesys PQ.
Atfer a while, you'll complete the mini PQ and unlock Hypnotize