Ok, this just screams fake to me. Honestly, need I point out some of the problems with this "Isshu Dex" (along with the other info)?
1. We all can agree that Sugimori stated that the Isshu Dex would work on originality and filling in types that are few in number. Some examples that directly come to mind would be Fire and Dark. Ice, Ghost, and Fighting could also need some lovin' by GF as well.
Not counting legendaries or starters, there are 4 new fire types. This in itself is incredible considering other, lower numbers from past generations. And although much of the Dex isn't even filled in (which I myself find odd being that this guy supposedly knows *so* much), 4 Fire so far compared to 8 new non-legendary Bug-Types and 7 new non-legendary/non-starter Grass Types (which isn't even counting Kurmiru and its evo's second type, making it an actual 10), this is scarce. Be careful to note that neither Bug nor Grass is in short supply. In fact, both are well-stocked and not far from the ridiculous ammount of Water types nationally.
As for the Dark type, there are 8.
2. Indicating Hatoopoo as Mamepato's evo. This has been speculated since the "reveal" of Hatoopoo, with no substantial proof provided thus far. First, although it is possible, it isn't very probable for a gray bird to evolve into a blue one. I, for one, might have believed it to be true if not for the description of the final evo. He describes it as the same blue coloring, but with a brown chest and pink mask, going on to speculate whether that is it's spring forme. This to me sounds like an oddly built pokemon, especially since it is apparently in the same pose as Hatoopoo was. Try imagining a light blue bird with a brown chest and pink face. The color contrast makes me feel like this guy just made it up on the spot.
3. All of these alternate formes. I would believe them, what with the seasonal changes and impending pokemon changes with it, if not for the ridiculousness of some. Example: Darumakka and Hihidaruma. A blue alternate form with an added psychic type? Geez, either GF is really over-killing the psychics this time around (and wanted to make a useless split-form of an already good pokemon), or this is just fake.
4. Where is Rankurusu, Gochiruzeru, Wooguru, Mamanbou, Swana, Emonga, and other revealed pokemon (both officially revealed and unofficially)? He had the kindness to fill in some "new" pokemon for us in the Dex, but not for some ones that have already been revealed? Why not these pokemon when others revealed *alongside* these unmentioned ones are in this Dex? Sure, he mentions them. How wonderful. "OMG HE'Z MENTIONED DA POKEMANZ HE GOTZ 2B TRUE!11" -_- He can't even give us names for the blue octopus and "green and yellow pokemon". Nor can he account for this polar bear (which of course would be cool if it were in the real Dex) or "standalone" Ice type, among other ones mentioned but not numbered.
5. As for the game info. It has all been speculated before, and that last note is just what pins some people to believing that this must be true.
When a scammer like this guy wants to really ensure a lot of people believe him, he throws in some dissapointing things with some exciting things. Naturally, it is very exciting to have a multi-typed gym, especially at the very beginning. But oh, what is this? No Dark-type gym? The exact type which has been the most wished-for and anticipated gym type of all so far? What a let down! Well, I guess you can't get everything you want...but wait, this guy would be a scammer if he had confirmed *all* of the hoped-for ideas as true. He would have just been pleasing everyone. So that means...OMG HE RLLY IZ DA REALZ THING!
^This is exactly the kind of reaction this guy is looking for by planting these "dissapointing reveals". Now, I'm not saying that there will definitely be a Dark-type gym in Isshu, but if there was or wasn't, and this guy knows, wouldn't it also make sense that he would know the numbers of those **already revealed** pokemon? It just doesn't add up.
And there is my 2 cents. Hope that cleared some things up a bit. On an ending note, I refuse to believe GF was idiot enough to only dual-type pokabu's evos, and then have the nerve to make it Fighting-type...I would go on a shooting frenzy if that were so.