* Pokemon Gold and Silver (Generation II) - These are their original games.
* Pokemon Crystal (Generation II) - This is the third game in Generation II.
* Pokemon HeartGold and SoulSilver (Generation IV) - These are remakes of Gold and Silver.
* Pokemon Let's Go, Pikachu! and Let's Go, Eevee! (Generation VII) - While you can't catch the Johto starters directly, you can obtain them by transferring them from Pokemon GO.
* Pokemon Brilliant Diamond and Shining Pearl (Generation VIII) - You can obtain them through trading or using the Mystery Gift feature.
* Pokemon Legends: Arceus (Generation VIII) - You can obtain them through the Mystery Gift feature.
* Pokemon Scarlet and Violet (Generation IX) - You can obtain them through trading or using the Mystery Gift feature.
So, while the Johto starters are originally from Generation II, they are also available in later games through various means!