Incorrect. Dragon Quest Monsters IV: Joker. It is an iteration of one of Dragon Quests's side series, and contains familiar but unique gameplay. In many ways, it can be described as Dragon Quest VIII converted into a Dragon Quest Monsters game.
You can't but you can make one @ dragon quest monsters.com
As far as I know, DarkKings don't appear in Dragon Quest Monsters Joker. It was only in a few Dragon Quest games.
yes
you hit him
If you want a Great Dragon you can synthesise Drakularge + Jamirus or Any Class-A + Any Dragon. http://www.flamingbaby.com/gaming/tips-and-tricks/dragon-quest-monsters-joker-monster-list-and-breeding-guide.html
Karthus
it is only out in japan but not in north America
Darkonium Slime + Captain Crow
No it will not sadly...
You can either synthesis them, get them in a trade, or get a couple as reward monsters after the game.
There are still a few things you should do in the game after it is completed. You need to complete the library of monsters either by scouting or synthesizing (A lot of the monsters in the library can only be owned by synthesizing them.) Once you complete the library of skills, you will get a Leopold from the secretary at MSO Headquarters.