Henshin, transformation, materia is a linking materia that lets it's holder take on the ablities of the materia that it's linked with. Like, if Yuffie took her Wutai henshin materia and linked it with a Fire materia, then Sailor Wutai's Limit Breaks (Ahem! Her Sailor attacks would be fire-based). On the same note, if she would take the Silver Emperium Crystal, or one of the other planet senshi's crystals, and linked it to her henshin materia, she would be able to use whatever attacks that sailor uses (for example: if she links her materia to Jupiter's crystal, she would be able to use ALL of Sailor Jupiter's attacks: from Jupiter Thunder Crash to Jupiter Oak Evolution). There are some draw backs to this: The planet senshi would not be able to transform and the final senshi can only assume that ablitity for a limited time.