Pokemons from generation two games cannot be transferred to generation three games?

Question

For example, Pokemon from the games gold, Silver, Criytal to Ruby, Sapphire, Emerald.

Comments

What is the question being asked here?

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You can transfer them if you use cheating software.

Answer 1

Yes, due to a restructure in how Pokemon stats work, and a platform switch, there is a hard stop between them. You can't transfer from Gen 2 to gen 3.
Also, a lot of new mechanics were introduced in gen 3.

Comments

This was because of max IV changes from 15 in gen 1 to 31 in gen 3. And also what helix said

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Also, Natures, Abilities, Birch's Theorem, Etc. That is why they made Red/Green remakes, to get all of the old Pokemon :P

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I've written, a lot of new mechanics