He's actually the official gym leader of Johto's Fighting Gym in Cianwood. (Which is gonna be the only city in another region you can get to in the game.)
And I'll put the original three starters in the Safari Zone. Along with other rarer pokemon and Hoenn Pokemon. Absol is going to be in the Safaris zone too!
No legendaries will be catchable in my game except Kroktasaur (Which I made up) and MISSINGNO. (Check the YouTube vid on the front page if you want to see him!)
Silver(???) is Giovanni's son. Good job. You've got a good knowledge of your Pokedudes.
It's actually a good suggestion but G/S/C take place 4 years after R/B/Y/FR/LG/Rby/Sap/E/D/P so he probably would be very young.
I'll defenately have people talk about Team Rocket/Team Magma/Aqua just to relate to the other games, but I won't put him in as a trainer.
I might put Eusine in the game, even though he was raised in Celadon City.