Some men aren't looking for anything logical, like money. They can't be bought, bullied, reasoned or negotiated with. Some men just want to watch the world burn.
-Alfred, The Dark Knight-
Above quote is made for how appropriate I felt it was. Generally. It's kind of hard to sum up how I feel about this one-shot, mainly because I came into it expecting a different sort of love for Pokemon, if you know what I mean. Perhaps the misleading nature of the title adds to the experience by completely throwing you off when you realize the true nature of the man's ranting, at which it honestly becomes quite bluntly horrifying. The first few sentences are also quite misleading.
I think what really grabs me about this is that prior to the revelation of what the man is and what he's done, you can -completely- misinterpret how exactly he loves Pokemon. You may come to think he loves Pokemon in a sexual or emotional manner, which is of course what immediately sprang to mind for me (to be fair I am a romantic sap and... need I say more?). This, due to Mood Whiplash, then makes the reveal of the truth all the more horrifying, which in turn causes it to hit harder. But on a level? This is brilliant, and I would go so far as to call it one of the better one-shots I've read. There's a saying, 'true art is incomprehensible'. This... may qualify. I think, personally, it does. You're writing about a horrific topic from a madman's perspective and yet there's something quite coldly lucid about the whole thing which only really gets broken as the man begins to rant. At first, I suppose, the man gives off this impression of a Hannibal Lecter-type on a re-read when you know the truth behind what he's saying, in fact I can draw a few similarities between our narrator and Hannibal. It's only when the mask starts to slip that the impression becomes more of a psychotic, Dark Knight-Joker-esque type, just lacking the fact that somehow the Joker can make pretty much anything funny, whereas this narrator just evokes... horror.
I personally think the structure you have now works. Because of the separation, the reader analyses each sentence more rather than moving onto the next right away, which makes the effect of what this madman is saying much more profound once you get the truth.
All in all? Excellent writing style, the misleading title is a definite thumbs-up from me because it makes the truth of things more hard-hitting, and overall I look forward to seeing more of your work in future.