I find this picture to be very interesting visually. I enjoy the calming purples and blues in contrast to the bright white flashes in it. It seems to draw your eyes back to it each time you look away, and I've found this to be a very good effect in art pieces.
I find this to be very original. I'd never considered the idea of a Space Rotom before, and whenever I see it it reminds me of a rocket (what with the colours and such.) I find this to be an appealing view, and I've never seen a Rotom quite the same as this one before!
I love the style you've used here. Relating back to the effect I mentioned in the Vision section, it really catches my eye. I think that part of this is due to the soft shape of the Rotom's plasma field (whatever that was in the game XD) compared to the sharp bright colours you used to accent it.
Each time I look up at this picture again, I seem to find one small detail about it that I hadn't noticed before. Everything from the tiny dashes above the Pokemon to the glowing dots below it... it all falls into place perfectly.
Five stars all around. You've done a wonderful job with this piece, and I commend you for it! Keep up the great work, *DrawerElma!