Complex sentence: Manaphy is available to a player of "Pokémon Diamond" or "Pokémon Pearl" when the player gets to the pokemart in jubilife talk to the man in green, assuming that the player has fulfilled all the requirements for the Manaphy egg in Pokémon Ranger.
Split into simpler sentences: Manaphy is available to a player of "Pokémon Diamond" or "Pokémon Pearl" when the player gets to the Pokemart in Jubilife City. Talk to the man in green, assuming that the player has fulfilled all the requirements for the Manaphy egg in Pokémon Ranger.