The closest thing to a group of witches in Sailor Moon would be the Witches 5, a group of antagonists from the *Sailor Moon R* season. They are:
* Eudial: The leader, with the power of mind control.
* Mimete: A shapeshifter.
* Viluy: Has the power to freeze time.
* Tellu: A "time witch" who can manipulate the past.
* Cyprine: Controls people's dreams and illusions.
While these antagonists are powerful and dangerous, they are not explicitly described as "weird sisters."