Rank them how? If added they'll likely work the exact same as the Gen 2 evolve items. As of now only the Sun Stone, Metal Coat, and King's Rock are used for multiple Pokemon, all of Gen 4's would be specific to a singular Pokemon except the Dawn Stone and Shiny Stone.
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Ah. So none of these gen 2 ones will work for any other future generations?
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The Sun Stone gets used for a few more in Gen 5 but I think that's it. It's been a while since I played Gen 6 so my memory is a little fuzzy.