Before we get started, please reserve your judgement until after reading the explanation. Ok so here it goes...

> Leaks mention Day/Night Evolution for the starters
The recent leaks that have been widely labeled as "Confirmed" mentions a few details of interest. One is that it mentions a Cat with a Type Gimmick and what would happen to the VC Games. It turns out this information is also present in another leak which came out earlier. It mentioned that the starter will have Day/Night evolutions
> It mentions Gyms so it is fake
We don't know who the leaker is or how they got the information in the first place. For all we know they might not be all that into Pokemon. They could have mistaken Kahunas or a trial Captains for Gyms. Who knows. Another possibility is that they put in fake info like the real XY leaks that said Chesnaught is Grass/Dark and Greninja Water/Fighting
> These are just a bunch of correct guesses
Corectly guessing a bunch of information? More than one piece of info? I don't think so
> The starters where confirmed fake
False. The person who said they made up the starter evolutions did not actually provide any proof except for the fact that they are a good drawer. Remember Wottergate? Someone went on about how they made up the starters and went into detail about their designs. Now that some people are good at the Pokemon Artstyle, Anyone could just go around and say "I made it up".
> Its Machamp not "Ballio" in the Litten evolution art
It doesn't have 4 arms and its legs look exactly like "Ballio's". It is too blurry to make out so we don't known. It could be Machamp, it could be either or.
> The evolution line doesn't make sense
The middle starter actually fits both evolutions in each case. Litten for example. It is bulkier like the Bipedal yet speedy like the quadruped evolution. Then there is Popplio. Just look at the Chespin line... Huge changes