Absolute 100% legit dad works for Gamefreak leak here.
>It's not two games. Just one. It's called "Pokemon: Let's Go!" What wild Pokemon you can encounter are based on whether you choose Pikachu or Eevee.
>Kanto Dex is updated to include evolutions from later gen games, which means 32 are added to the original 151, making it 183.
>Pikachu can use its various Cosplay forms, can wear a hat for Cap form, and also gets a Detective form. You can evolve it to Alolan Raichu if you have any Alola Form Pokemon in your party.
>Eevee gets more evolutions, Eevee and all evolutions get buffed in general.
>The Rocket Game Corner now has a bunch of minigames instead of slot machines, and the prize money is BP.
>Because this isn't the same universe as the one RBY take place in, Kanto is slightly different, and some events haven't happened (like the eruption).
>Totems return. Beedril is the first one you encounter, in Viridian Forest. Something is causing Totems to appear in Kanto.
>Alola Forms return, in unusual ways and are much more difficult to get than their base forms. They exist mainly to balance out Kanto's lacking of certain types.
>The story is expanded to include the consequences of introducing Mega Stones, Z-Rings and Z-Crystals to Kanto. Giovanni is more ambitious.
>Jessie and James return, like in Yellow. All fights are double battles. Arbok is to be reckoned with.
>Two post-game stories. One is visiting Johto. The other is working with Looker to track Ultra Beasts hiding in Kanto.
