Where do you find the seven sages for looker in Pokemon White?

You can't find the "Seven Sages" in Pokemon White. The Seven Sages are a group of characters from Pokemon Black and White 2, not the original Black and White games.

In Pokemon White, you'll encounter the Elite Four at the end of the game, which is a different group of trainers.

If you're interested in learning more about the Seven Sages, you can find information about them in the Pokemon Black and White 2 games or online resources.