Enigma

Enigma is a type of Berry that can be planted in the Farm. It can be obtained by linking your game to a Discord account, obtaining 4 different hints from the Kanto Berry Master and surrounding an empty plot with berries according to those hints.

Additional Mutations
Planting Enigma berries next to certain other berries will cause them to mutate. For all of these mutations, the goal berry must already be unlocked for the mutation to occur.

(*These berries cannot be unlocked currently, and as such cannot be mutated into using this strategy.)