The original Link Cable requirements are replaced with 3DS wireless communication , allowing for Link Trades and Link Battles with other 3DS Virtual Console versions of Gold, Silver, and Crystal.
It is fully compatible with Pokémon Bank (via Poké Transporter), allowing you to move your Johto Pokémon to modern games like Pokémon Ultra Sun and Ultra Moon . Pokemon Crystal Version 3DS (WORLD) CIA (VC-GBC)
As the "definitive" version of Generation II, Crystal introduced several firsts: The original Link Cable requirements are replaced with