This dialogue unlocks one of Professor Oak's Fame Checker entries.FRLG
From this point onwards, the player will be able to use the Pokédex, access Professor Oak's PC, battle or trade Pokémon with other games, and buy items from Viridian City's Poké Mart.
Diamond, Pearl, Platinum, Brilliant Diamond, and Shining Pearl
When brought to the player's rival in Jubilife City's Trainers' School, the Parcel will be opened, revealing that it contains two Town Maps. The player and their rival take one each.
A parcel to be delivered to Professor Oak from Viridian City's Poké Mart.* A parcel entrusted into your care. You're supposed to deliver it to your childhood friend who left Twinleaf Town.*