All the pets under Leo had specific training depending on their skills.
For example, the Nightmare Butterfly, every night has to use its skill [Deep Sleep] to put Leo into a deep slumber to recover his stamina and mind power.
Not only that, it should use [Deep Sleep] on the other pets too.
On the other hand, it would help Nightmare Butterfly's proficiency over the [Deep Sleep] would increase.
In short, the Nightmare Butterfly has the duty to put everyone into a good sleep and help them recover their energy.
Giant Storm Eagle, Verdant Blade Hawk and Crystalwing Butterfly would fight each other. Of course, mostly it was a battle between the Eagle and Hawk whereas the Crystalwing Butterfly would use it [Crystal Body] to receive some of the attacks from both sides.
As for the Thunder Bears, Leo ordered them to do the same things like sit, stand, walk and even fight. They use the same attacks on the training dummies while trying to maintain the same style.