Roseli

Roseli is a type of Berry that can be planted in the Farm. It can be obtained by surrounding an empty plot with at least 1 ripe Mago, at least 1 ripe Nanab, at least 1 ripe Magost and at least 1 ripe Watmel. It emits an aura that increases the chance of encountering a wandering Pokemon.

Possible Planting Formations
You can fill your farm in the following way to obtain this berry.