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I had this idea for a Mega Luxray design that I half-drew before forgetting about it and then eventually losing the file.
>the parts of it that are black turn electric blue, what was once fur tufts becomes coursing electricity (think like Rapidash's mane but electric)
>the parts of it that are currently blue become fully transparent, like a tadpole, leaving the skeleton visible
It's the X-ray Pokémon, right? Well what better way to showcase that then by making its bones visible? And when things are cartoonishly struck by electricity, you see their bones as well.
You're see its eyes sockets and jaw, its ribs and spine and the bones of its legs. The explanation would be that Luxray is overflowing with so much electrical energy that you can see through it.