[Hall of Famer]

You can create as many levels as you like, even a million or billion is possible. There is no upper limit to the number of levels you can make for each pet.

There is a way of course, but Mysidia by default does not come with a level name, and the level is identified by species ID/name and level number. You can achieve this by adding a new field called 'levelname' in database table adopts_levels, and then modify the file /classes/class_adoptlevel.php file to add a new field for adoptable's level class.

This is not the end yet, you have to edit the level.php file in admincp folder to change how levels are inserted to database, so you wont break admin control panel. Finally, you can edit every file that shows adoptable's species name to the level name. I cant think of where these files are, but you can search for keywords such as $adopt->getType() and you may find them. For level description, you can do something similar here with new field 'description', it will be just like how you add level name.

Anyway it is not very hard, with basic coding skills it should be perfectly doable. Just it can be tedious and will require you to change code in many files. Take care, and have fun coding.