It is not made they just find it in some tubes.
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Dialga is not in that Pokemon Emerald. Back when that game was made, Dialga didn't exist.
You cannot get Arceus in Pokémon Emerald because Arceus wasn't made for Pokémon Emerald so there is no data for it within the game. Arceus was only made for Pokémon Diamond and Pearl as well as future games.
The shiny stone is not obtainable in emerald. It was only made in gen 4 (I V)
No, Togetic cannot evolve in Pokémon Emerald. Togetic's evolution of Togekiss wasn't created at the point Emerald had been made.
Darkrai is unobtainable in the original Hoenn games and before. He was revealed in Diamond, Pearl, and Platinum first, which were made way after Emerald.