Tell the Berry Master's Wife (on Route 123) the phrase Cool Latios, which is obtained by catching the legendary Pokémon after defeating the Elite Four.
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after 3500+ steps.
Growth and harvest
Generation III
A Durin Berry will mature from a planted seed to a full-grown, fruit-bearing tree in 72 hours, with 18 hours per stage. A Durin tree will yield 1-2 berries.
Generation IV
A Durin Berry will mature from a planted seed to a full-grown, fruit-bearing tree in 60 hours, with 15 hours per stage. A Durin tree will yield 3-15 berries.