During the course of your journey, you'll be able to pick up a lot of valuable skills from the Masters you encounter. Here's a list of the Masters and the skill you can learn from them.
Bunyan
Location: In a hut in Cedar Forest
Requirements: None
Skills Learned: Risky Blow (2 Levels), Focus (5 Levels), Super Combo (8 Levels),
Disembowel (10 Levels)
Stat Alterations:
HP -- +2
AP -- -2
Attack -- +2
Defense -- +1
Intelligence -- -2
Deis
Location: Behind the Stone Slab in Mt. Zubo
Requirements: You have to wait until she is rested
Skills Learned: Inferno (2 Levels), Blizzard (5 Levels), Thor's Hammer (8 Levels), Sirocco
(11 Levels), Seven Senses (15 Levels)
Stat Alterations:
HP -- -3
AP -- +3
Power -- +1
Defense -- -3
Agility -- +1
Intelligence -- +3
D'Lonzo
Location: Top of the hill at the Coffee Shop
Requirements: You have to have 15 different weapons in your inventory at once
Skills Learned: Monopolize (2 Levels), Intimidate (3 Levels), Steal (4 Levels)
Stat Alterations:
HP -- -1
AP -- -2
Attack -- +1
Agility -- +1
* Accuracy Percentage Up
Durandal
Location: Located behind the wall at Wyndia
Requirements: None
Skills Learned: Unmotivate (1 Level), Feign Swing (2 Levels), Backhand (3 Levels)
Stat Alterations: None
* Can't use any acquired skills
Emitai
Location: Inside a hut near Dauna Mine
Requirements: You have to pay him 10,000 Zenny
Skills Learned: Antidote (2 Levels), Mind Sword (4 Levels), Chakura (6 Levels)
Stat Alterations:
AP -- +4
Offensive Power -- -2
Defensive Power -- -2
Intelligence -- +4
Fahl
Location: At the Pub in the Arena Town
Requirements: Fight 30 times, in a row, without resting once
Skills Learned: Charge (2 Levels), Counter (4 Levels), Resist (6 Levels)
Stat Alterations:
HP -- +4
Attack -- +1
Defense -- +3
Agility -- -3
Intelligence -- -3
Giotto
Location: Located at the Beach in the Rhapala area south of the Checkpoint Bridge
Requirements: Must have 3,000 Fishing points and possess a status higher than Rod Master
Skills Learned: Trump (2 Levels), Beserk (5 Levels), Sudden Death (8 Levels)
Stat Alterations:
HP -- +4
AP -- +3
Offensive Power -- -1
Defensive Power -- -1
Agility -- -1
Intelligence -- -1
Hachio
Location: In the Kitchen area at Wyndia Castle
Requirements: You have to bring him the following items: Beef Jerky, Martian Squid,
Swallow Eye, and a Fish Head
Skills Learned: Mighty Chop (2 Levels), Demon Cutter (4 Levels)
Stat Alterations:
HP -- +2
AP -- -2
Attack -- +2
Defense -- +1
Agility -- -1
Intelligence -- -1
Hondara
Location: At Urkan Tapa
Requirements: Must have learned the Backhand skill from Durandal
Skills Learned: Meditation (2 Levels), Kyrie (5 Levels), Benediction (8 Levels)
Stat Alterations:
AP -- +1
Power -- -2
Intelligence -- +1
* Holy properties increased
Ladon
Location: At the Wall relief above the Port Drive in Dragonier
Requirements: Must have all eighteen Dragon Genes. Then, search the small dragon statue in
town -- it will only appear to Ryu
Skills Learned: Mind's Eye (3 Levels), Deity Attack (5 Levels), Horror Barrier (7 Levels),
Horror Smash (9 Levels)
Stat Alterations:
HP -- -6
AP -- -6
Power -- +2
Defense -- +2
Agility -- +1
Intelligence -- +2
Meryleep
Location: In the Mysterious Forest near the Eastern Checkpoint
Requirements: First, throw a rock in the lake. Meryleep will appear . Bring her the Flower
Jewel from the River Gang Hideout located near Mykss George -- You have to have the Faerie
Tiara
Skills Learned: Charm (2 Levels), Shadowalk (5 Levels), Battle Song (8 Levels)
Stat Alterations:
HP -- -1
Power -- -1
Defense -- -1
Agility -- +2
Mygas
Location: Mygas can be found at the Tree Stump near Cedar forest
Requirements: You must give him all of your Zenny -- he'll teach even if you don't have
any zenny
Skills Learned: Frost (1 Level), Barrier (4 Levels), Magic Ball (6 Levels), Shezaaga (8
Levels)
Stat Alterations:
AP -- +1
Attack -- -1
Defense -- -1
Intelligence -- +2
Yggdrasil
Location: At the Tree location east of the Plant
Requirements: Give him some Wisdom Fruit -- he'll only talk with Peco
Skills Learned: Sanctuary (2 Levels), Recall (5 Levels), Mikatect (8 Levels)
Stat Alterations:
HP -- -1
AP -- +1
Attack -- -2
Defense -- +1
Intelligence -- +2
* Low defense against Fire
Bais
Location: On a wooden platform overlooking a mossy fossil skull inside Dauna Mine
Requirements: None
Skills Learned: Tune Shift (3 Levels)
Stat Alterations:
Power -- +1
Lee
Location: Eastern Checkpoint -- behind the huge wall on the side closest to the bridge
Requirements: None
Skills Learned: Intelligence Shift (3 Levels)
Stat Alterations:
Intelligence -- +1
Wynn
Location: Junk Town, behind the far west house
Requirements: None
Skills Learned: Enhanced Shift (3 Levels)
Stat Alterations:
HP -- +1
Lang
Location: Castle Wyndia, behind a tomb-stone in the main room of the catacombs
Requirements: None
Skills Learned: None
Items received: Cupid's Lyre (gain HP while walking -- 3 Levels)
Stat Alterations:
Defense -- +1