I do think that could be a funny scene though, they charge her to see if it would work and then they got a hyper Jirachi who's somehow still asleep doing random wishes and giving into intrusive thoughts.
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She'd be granting her own wishes for everyone else, regardless of if they want them granted or not.
Like she'd wish that Lugia's ass would always be bouncing and then sprint off again, leaving Lugia complaining that she can hardly walk due to all that jiggle going on behind her.
I've got a good idea how to end the scene too, but that'll stay secret until it's written