If the holder is hit by a Normal-type attack, it will consume its held Chilan Berry and halve the attack's damage. If the holder has Ripen, the damage is multiplied by 1/4.
In Generation IV, it also activates for Struggle despite dealing typeless damage. The Chilan Berry no longer activates for Struggle in Generation V onward.
A Chilan plant will yield 1-5 Berries. A growing Chilan plant's soil dries by 6% every hour, fully drying out in 17 hours.
Generation V
Planted 0 hours
Sprouted 27 hours
Taller 54 hours
Flowering 81 hours
Berries 108 hours
A Chilan plant will yield ? Berries.
Generation VI Pokémon X and Y
Planted 0 hours
Sprouted 8 hours
Growing 16 hours
Bigger 24 hours
Budding 32 hours
Bloom 40 hours
Berries 48 hours
A Chilan plant will yield 3-20 Berries. During its growth, watering the plant adds 1 Berries to the final harvest, weeding it adds 0.5, and removing a pest adds 2. Chilan plants attract Combee as pests.
Pokémon Omega Ruby and Alpha Sapphire
Planted 0 hours
Sprouted 8 hours
Taller 16 hours
Flowering 24 hours
Berries 32 hours
A Chilan plant will yield 2-10 Berries.
Generation VII Pokémon Sun, Moon, Ultra Sun, and Ultra Moon
Planted 0 hours
Sprouted 30 hours
Taller 36 hours
Flowering 44 hours
Berries 48 hours
A Chilan plant will yield 2 Berries if Isle Aplenny is at Phase 1, 4 Berries if it is at Phase 2, and 6 Berries if it is at Phase 3.
Generation VIII Pokémon Brilliant Diamond and Shining Pearl
Unlike the other damage-reducing Berries, the Chilan Berry weakens attack damage (except by moves that deal direct damage) regardless of type effectiveness, instead of super effective damage only. This may be because Normal-type moves cannot normally be super effective.
The Chilan Berry does not weaken Present if it heals the target.
When buying Chilan Berries in Join Avenue, the text will say "A set of four Chilan Berries. They weaken a supereffective Normal-type attack against the holding Pokémon." This is most likely a mistake since all other damage-reducing Berries only work if the attack is super-effective.
Origin
The Chilan Berry's design and name may be based on a Chinese lantern.