Celebi healed in the movie by being taken to the Lake of Life , where it used Recover to restore itself. Later, when it was badly weakened again, the other Celebi from the past and future came to help heal it fully.

Quick version

  • First healing: Celebi goes into the Lake of Life and uses Recover.
  • Final recovery: When it’s too weak to heal itself, the other Celebi arrive and restore it.

In the story

At first, the lake acts like a healing place for Celebi. But after the Iron- Masked Marauder’s control and the damage done to the forest, Celebi becomes too weak to recover on its own.

That’s why the movie shifts to a more magical fix: multiple Celebi from different times gather and heal their friend, bringing it back to full strength.

If you want, I can also give you the full movie plot in 5 lines.