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You have to master 2 animist abilities
You must first master 5 black mage skills.
The player must master 2 illusionist A abilities to unlock the Alchemist job class.
If you mean the monster dragon, then get a hunter (by mastering 2 archer abilities) and capture it, or if you mean the bangaa dragoon, master 2 warrior abilities.
all you got to do is master two thieve abilities
master 3 fighter skills of hume. to become a fighter, you need to master 2 skills from soldier.
Complete the "Eastwatch" mission and master 3 fighter abilities.
Master 2 warrior abilites to lock dragoon(plus it unlocks gladiator and defender)
I would suggest this website if you are using (U) and (J) section, though I can not guarantee the =Master Code= section. (Final Fantasy V Advance [U] and [J]) http://gshi.org/?s=v2&sys=7&gid=6325 The instruction are below here to convert from (U) to (E). (Final Fantasy V Advance [EUR]) http://gshi.org/vb/threads/4301-Final-Fantasy-V-Advance-EUR
Ap stands for action points they allow you to master the abelties on your weapons and aomor so you can use them anytime with any job
To get to be a summoner in final fantasy tactics advanced, you need to master 2 white mage abilities and 2 elementalist abilities. To be an elementalist, you need to master 1 fencer and 1 white mage ability. Me personally would prefer an assassin though. To be an assassin, you need 1 sniper and 2 elementalists. To be a sniper, you need to master 2 archer abilities. Hope this helps.
You can't use monsters like using them in battle with you, but you can control them with a Beastmaster (Nu Mou), or morph into them as a Morpher (also Nu Mou). To get Morpher you have to master 5 Beastmaster A-Abilities, and you can't Morph unless you've captured a monster with Hunter (Human), which takes 2 Archer A-Abilities.