Rowap Berry is an item in the “Other” category (Berries). It costs ₽80.
In-game descriptions
| Diamond / Pearl · Platinum | A Poffin ingredient. If held by a Pokémon, and if a foe’s special attack lands, the foe also takes damage. |
|---|---|
| HeartGold / SoulSilver | If held by a Pokémon and a foe’s special attack lands, the foe also takes damage. |
| Black / White · Black 2 / White 2 | If held by a Pokémon and a special attack lands, the attacker also takes damage. |
| X / Y · Sun / Moon · Ultra Sun / Ultra Moon · Let’s Go, Pikachu! / Let’s Go, Eevee! · Sword / Shield | A Berry to be consumed by Pokémon. If a special attack hits the Pokémon holding it, the attacker will also be hurt. |
Where to find it
Not placed on the atlas maps (so far: Red/Blue and Generation 3).
Sources : PokeAPI (items, item_flavor_text, machines) · atlas · pokeemerald species_info.h