Heya! Sorry, but we won't really be able to answer these questions as much as you'd probably like, as some of these elements will feature in the plot of the game.
1) We can't say where Union is, but that first assumption isn't correct, no. It would be possible for stories/legends to have been passed down, but in a distorted/misremembered form. Former region names wouldn't be known.
2) We can't give you any details, but within the context of the game, all legendaries are, for all intents and purposes, gods. Legendary names, as stated in previous questions, aren't known. The vast majority of legendaries are unique despite what may be seen in other media, and all of them are probably still around keeping tabs on the world. Probably. Of the Johto legendaries you've listed, you should, OoC and as a player, have a good idea already about what one of them is doing and where they reside, particularly in light of a recent event and maybe its conclusion. That's all we can really say at the moment!
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1) We can't say where Union is, but that first assumption isn't correct, no. It would be possible for stories/legends to have been passed down, but in a distorted/misremembered form. Former region names wouldn't be known.
2) We can't give you any details, but within the context of the game, all legendaries are, for all intents and purposes, gods. Legendary names, as stated in previous questions, aren't known. The vast majority of legendaries are unique despite what may be seen in other media, and all of them are probably still around keeping tabs on the world. Probably. Of the Johto legendaries you've listed, you should, OoC and as a player, have a good idea already about what one of them is doing and where they reside, particularly in light of a recent event and maybe its conclusion. That's all we can really say at the moment!