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Yes, Is like trying to catch a Deoxys and send them to XY
The Deoxys exists in XY, but you can't get it there
Also, the Salac Berry and most berries were intoduced in gen 3 and 4, soit makes sense that they exist in XY
And finally, you can get almost all berries in XY by Mutation
Pokemon not obtainable in a Pokemon game is always a given since they usually do events/splitting the games in two for trading in order to obtain them. If it wasn't possible to catch 'em all then it would detract from the overall core driving point of the franchise, exceptions being alternate formes.
But items are a different story; usually Game Freak expands upon the original Gen III engine's list of items for each generation while keeping older items around in case, but sometimes they remove certain items to either free up space or if it's no longer needed. (aka certain plot items/key items) Luckily berries are one of the few exceptions to this.