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.

Possible Planting Formations
You can fill your farm in the following way to obtain Enigma berries. As the berries needed to be planted are unique to each save file, a general diagram is used here to describe where particular "hinted" berries should go. Purple squares indicate where mutations can occur.

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.)