Soothe Bell

The Soothe Bell is a type of held item. It is an out-of-battle effect item that amplifies Happiness (Friendship) increases for the holder.

Location

You can find the Soothe Bell in the Johto National Park

soothe bell
Source: Mayday's PokeOne Guides.

Note: You cannot be in the bug contest while trying to get the Soothe Bell.