Black out
When all your Pokémon faint, it will black out. Just like game over screen of other RPG games. The player will pay to the trainer/drop money from a Wild Pokémon. Here are the images:
After blacked out, you will send to Pokémon Center and heal your Pokémon scene.
Nurse:
First, let's restore your Pokémon to full health.
There! All happy and healthy!
Good luck and take care!