Throughout MR2, you will be asked to upgrade a multitude of things: your ranch house, your stable, and your shrine for dead monsters. Get all of the house and stable upgrades, which require you to have a certain rank for each of them. (You will start being offered upgrades when you 1. Have at least 5,000 G. 2. Are at or beyond breeder rank 3, and 3. It is May Week 4.) Each upgrade costs a pretty penny (the most being 30,000 G), so be sure to save up for every May Week 4. When you get the final upgrade, a house upgrade, at Breeder Rank 8 for 20,000 G, a long cut scene will occur, in which Binto's secret will be revealed. At the end of the scene, you will receive a Bajarl pot; use this when combining two monsters (of any breed) to get a Bajarl.
Get to 4th breeder rank. Raise a hopper to B class or higher (I reccomend you do this with the same monster you get to rank four with). The hopper will dig up "hot springs" in the winter months. This will unlock Undine and Niton. Then, get yourself to rank six (again, if possible, same monster) with a B or higher monster. Send a monster to Torble Sea. They will warn you about a water monster. After completing the four basic drills there, you will fight a monster. You will randomly fight "Zilla King" (who is very powerful. LIFE:684 POW:841 INT:310 SKI: 396 SPD:155 DEF:787). Beat him and get a Zilla Beard. Use in combining to get a zilla.
UNLESS YOU LIKE LOW SKILL MONSTERS, DO NOT RAISE THE COMBINED ZILLA! COMBINE IT WITH A TIGER OR A JELL AND THEN USE IT! I DO NOT RECCOMEND THE PURE!
Unlock Joker: Go to the Volcano a second time with Dr. Talico and take the 1st right and follow the trail until you reach a large building with stairs. Search there until you find a mask and then combine it with any monster to get a Joker.
Unlock Gold Suezo: Combine a Silver Suezo with a Bronze Suezo.