Dragon Warrior Monsters 2 United

Tips on Usage: This section will detail how to solve each side quest in the game, and how to take advantage of all the breeding opportunities. So as not to give spoilers, I have separate links to the full hints. Quests related to the Navel will be detailed in the Main Gates section.

Quick Reference: Mom's - TinyMedal - Breeding - King's - Keys
These are the different breeding opportunities (and opportunities to get special monsters to join) that will come up at different points in the game (broken down by what key you will be working on, or how many monsters you have in your library after completing the game). New ones will be available after beating that particular key (or fulfilling that particular requirement).

Before Ending	Oasis - Pirate - Ice - Sky - Limbo
After Ending	# of Monster: 0 - 100 - 150 - 250

Oasis Key Opportunities
All of these will be available while you are working on the Oasis Key.
Breeding	Joining
None	CurseLamp

Pirate Key Opportunities
All of these will be available while you are working on the Pirate Key.
Breeding	Joining
None	HoodSquid

Ice Key Opportunities
All of these will be available while you are working on the Ice Key.
Breeding	Joining
Near Arena: Armorpede	None

Sky Key Opportunities
All of these will be available while you are working on the Sky Key.
Breeding	Joining
Near Arena: WildApe	MadCondor

Limbo Key Opportunities
All of these will be available while you are working on the Limbo Key.
Breeding	Joining
Near Arena: Gulpple	None

Just After Beating the Game
All of these will be available right after beating the game, regardless of how many monsters are in your library.
Breeding	Joining
Near Arena: Skeletor Near Tavern: FunkyBird	From Couple: WhipBird egg From Merchant: Lionex egg

Having 100 Monters
All of these will be available after getting 100 different monsters in your library.
Breeding	Joining
Near Arena: StoneMan Near Tavern: CopyCat	None

Having 150 Monters
All of these will be available after getting 150 different monsters in your library.
Breeding	Joining
Near Tavern: Andreal	None

Having 250 Monters
All of these will be available after getting 250 different monsters in your library.
Breeding	Joining
None	Talk to Warubou and his kid will join. Petibou is a Warubou type.