Slimes
The Slime family features a high amount of hit points (HPs) and magic points. Their attack skill is average and they are weak against elemental-based magic attacks. Fangslime is created by breeding any slime with a MadCat, DarkHorn, KingLeo or GulpBeast. To breed the powerful GranSlime, you will need to breed two GoldSlimes together or a GoldSlime and a DarkMate or Deathmore.
Dragons
Dragons feature high HPs and Attack. To breed DragonKids, combine any member of the Dragon family and any Slime. Combining any Dragon with a Phoenix will yeield a SkyDragon, while a GreatDrak and Lionex will form Serpentia The most powerful dragon, Gigadraco, can be obtained by breeding Andreal with BossTroll from the Devil family.
Beasts
Beasts rely on their strength and physical attack power and are able to withstand both physical and magic attacks with their high defense stat. Create a GulpBeast by combining a Grizzly with any Devil or Dragon. WindBeasts are bred from a CatFly and Bird. The top Beast, Dumbira, is the product of NoctoKing and Gigantes.
Birds
Birds feature a high agility stat. You can create MadCondor by breeding LandOwl and a Devil. Breed the MadCondor with a SlimeBorg to yield WhipBird.
Plants
Plants have a low agility rating, making them susceptible to physical attack. Combine TreeBoy and BeastNite to gain FootHero, or RoseVine and Gigantes to make Egdracil.
Bugs
The starting HPs of members of the Bug family fall below any other monster. MultiEyes, the most powerful monster in the Bug famly, is created by combining TailEater with any member of the Devil family. MultiEyes can also be bred using two Catapila.
Devils
Devil monsters can both attack and defend successfully against the other monster families. Use ArcDemon and a Dragon to create Centasaur, then use that Centasaur and any Boss monster to breed LampGenie.
Zombies
Reaper Zombies are created with the combination of any other Zombie and a WeedBug, while FoxFire can be bred with NiteWhip and any Beast. Niterich is used alongside PsychoPiz in the breeding of Orgodemir, one of the top monsters in the game.
Materials
Material monsters feature high magic resistance attack skills. You can breed a Golem by using two MudDolls, while MetalDrak can be created by mixing any Material monster with Andreal. To create the CloudKing, you must breed a Gismo and a KingSlime.
Water
The Water family of monsters specialize in magic over physical attacks. Creating the powerful Starfish requires one of either the HoodSquid, OctoReach, Octogon or KingSquid to be combined with a Slime of your choice. Merman is the result of any Water and Devil monster, while MerTiger comes from Merman and a GulpBeast.
Bosses
Boss monsters are the most rare find in Dragon Quest Monsters 2. Each boss comes from a previous game in the series such as Dracolord and Zoma. Boss monsters are unique in that the lowest level monster, Dracolord 1, is created from the combination of two different families; Servant from the Zombie family and Andreal from the Dragon family.