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>In Ruby, Sapphire, and Emerald Versions, Olivine City is the original hometown of the player character and his/her father, Norman.
So then R/S/E's only REAL tie to the other game's is that the Protag was originally born in JOHTO?
Are there any reference's in Johto to Norman? Maybe if there's an NPC that speaks of Norman we can figure out when he left?
Also, not much but,
>A scientist working for the Devon Corporation in Pokémon Ruby, Sapphire, and Emerald mentions that he is trying to create a device that visually reproduces the dreams of Pokémon, but that he is not succeeding. Likewise, in the anime, Devon is trying to construct a Dream Visualiser, which is the function of the Pokémon Dream World, introduced in Generation V.
At the very least, this should mean that R/S/E fits in the timeline BEFORE the events of B/W where Fennel has a machnie for Dream World.