From Bulbapedia, the community-driven Pokémon encyclopedia.
The Watmel Berry (Japanese: カイスのみ Kaisu Fruit) is a type of Berry introduced in Generation III. Its description claims that it can grow over 20 inches, making it the largest Berry.
Growth and harvest
A Watmel Berry will mature from a planted seed to a full-grown, fruit-bearing tree in 72 hours, with 18 hours per stage. A Watmel tree will yield 1-2 berries.
A Watmel Berry will mature from a planted seed to a full-grown, fruit-bearing tree in 60 hours, with 15 hours per stage. A Watmel tree will yield 2-15 berries.
At 100% performance, this Berry will contribute 250 units of powder.
At 100% performance, this Berry may produce a level 27 Sweet-Bitter Poffin.
In the anime
Watmel Berries in the anime
A Watmel plant appeared in PK23. Snivy used a Watmel Berry from the plant to lead Snorlax away from the hole which the Rinka Berry fell into, as it had rolled on top of the hole.
||カイスのみ Kaisu no Mi
||From スイカ Suika (Watermelon).
|| Baie Stekpa
||슈박열매 Syubak Yeolmae
||From 수박 subak, Watermelon.
||Refers to the muskmelon, but is most likely derived from 甜 tián (sweet) and 水瓜 shuǐguā (watermelon).