I have collect 3 pets on my quests and i have plenty of room for another. But the pet I want is a female Ryori. how do I generate her?

Ryori are one of the seasonal fabled pets
- if you want to catch a wild one, they appear only during the Fall Fest
- you can buy ones other players have for sale
However, to Generate one, you can see a list of ways to obtain essences that we wrote up here. Because they are a fabled species, they tend to be more expensive than regular common species' essences.

Once you obtain an essence, you go to the generator, click the bit that says 'Load Essence', choose the rarity of the essence you have and want to use, then scroll, click it, and load it.