Well the reason these two games are canceled beacause the Nintendo 64DD was such a failure so they decide to cancel these three games and decided to make Pokemon Studium 2 is like the first one but more Pokemon and here are my ideas for these two games
Pocket Monsters 64/Pokemon 64 (1999)
Things starting to be quiet around Kanto unit evil stucks by Team Rocket returns once again and one day a ten year old newbie pokemon trainer Yuji Naksomakua was ready for his starter pokemon so he go to Professor Oak and he started out with a Evee so he decided to go out to stop team rocket and get all the badges in Kanto
Special: You can tranfeser Pokemon from Red/Blue/Yellow to make your team better than ever if you wana catch them all and after you beat the game you could get to fight Red and Blue in the Unknown Dungeon
Pocket Monsters RPG/Pokemon 64: The Legend Of Thunder (2000)
One dark day in Johto evil struck by and it turns out Team Rocket is back once again and a ten year old boy from Cherrygrove City his name was Taku Moto went out to see Professor Elm for his starter Pokemon so he got a Evee as a starter and Yuji appeared and he decided to help Taku and to stop Team Rocket from turning Johto into a nightmare
Special: You can transfer Pokemon from Red/Blue/Yellow/ and Gold/Sliver/Crystal and you can fight Red, Blue, Gold, Sliver, and Yuji right after you beat the game and go to Mt Sliver
Like my Ideas thought