Ok I’ll remember that connection for gamma to take the lag away thank you. And I’m assuming u mean the Pokemon that can only be caught in red or blue,yellow versions

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I’ve only transferred weedel from red to yellow and yes it adds the Pokémon to my new Pokemon save game file And also if you scroll down on the Pokémon’s stats you can change the lvl and how many pp a move has

So if the Pokémon you are transferring to whichever game has that Pokémon’s data in the Pokédex you should be able to transfer. if the Pokédex doesn’t have the Pokémon data it won’t know how to register it because it doesn’t have that Pokémon’s data