You can't
I hear you can trade from crystal to sapphire. You have to have two gameboy advances, a gba link cable, and in crystal you have to go to the time machine.
no
Trading between Crystal and XD is not possible.
yes, but you how to have some kind of cord to trade.
Red, Blue, Yellow, Gold, Silver, and Crystal can trade between themselves. Ruby, Sapphire, Emerald, Firered, and Leafgreen can trade between themselves. Games from list 1 cannot connect with list 2.
yes but you need a ruby and sapphire gem and a link cable
Nope. sorry
you trade sunkern from Pokemon gold/silver/crystal and evolve it with a sun stone
you can't.
If you want to fill your pokedex, you must trade between Ruby and Emerald to gain the Pokemon that are not in Sapphire.
Crystal cannot trade to Leafgreen because for a couple reasons: One that the game is on a different console and is not compatible with the Gameboy Color, Two since the game had not came out when Crystal was released no program was created to trade between the newer games that would follow Crystal even if the newer games are remakes of the older ones such as Firered and Leafgreen.
They should be able to trade.