*Note : if you guys have better idea, please do post here, cause i also wanna know ><*
1st Job Advancement
Lv 1 - 10 = beginner quest / snail or mushroom
LV 11-23 Blue Ribbon Pigs ( Nautilus Port : Blue Ribbon Beach )
Lv 10-16/17 = Horned Mushroom
Lv 17-21 = Golem
Lv 21-30 = Mixed Golem ( Mini Dungeon )
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2nd Job Advancement
LV 30-36 Mushroom Kingdom Mobs
Lv 30-51 = Monster Carnival 1
Lv 51-55 = Trucker
Lv 55-57 = Toy Trojan
Lv 57-60 = Robo / Master Robo
Lv 60-70 = Ghost Ship PQ
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3rd Job Advancement
Lv 70-74 = Bye Bye Station ( Mini Dungeon )
LV 70-76 Mecateon ( Omega Sector : Boswell Field VI )
Lv 74-80 = Scorpion
Lv 81-92 = Magatia [ Find any monster that about 1 or 2 level about you ]
Lv 92-120 = MP3
Lv 105 -113 = Kru and Captain [ Herp Town ]
Lv 113-120 = Dual Ghost Pirate [ Ludibrium ]
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4th Job Advancement
LV 120-129 Gigantic Spirit Vikings ( Ludibrium : Twisted Time )
LV 129-135 Lycanthrope ( ElNath : Wolf Territory 3 )
LV 135-140 Bains ( Showa : Armory )
LV 120-140 Daily Papus
Lv 130 above Lucky Samu
useful link :
http://forums.asiasoftsea.net/showthread.php?t=922324
http://forums.asiasoftsea.net/showthread.php?t=866129
Lv120 on wards i have no idea >< anyone can please suggest?
Credits to iMrAlvin