I was thinking more like you make the fusion happen before a battle and that it would work like Kyurem and Necrozma does, where they are fused until you decide to separate them out of battle.
My idea for a mechanic would be fusion, BUT with a twist. A universal item called the Union Stone will be used rather than a separate item for every fusion. It would be called Unision, the name is the combination of fusion and unison. This one, unlike the other ones, is a permanent form change...
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