yes you can
1st off there is only one pokemon crystal and that's for gameboy color so I'm not sure what u are talking about.
Trading between Crystal and XD is not possible.
You can't
NO SORRY YOU CANT TRADE WITH POKEMON CRYSTAL AND FIRERED AND I HAVE TRIED AND IT DOSENT WORK YOU SEE FIRERED IS AN GBA(GAMEBOY ADVANCE) AND CRYSTAL IS GBC(GAMEBOY COLOR)AND THEY ARE'NT COMPITABLE TO EATCH OTHER SO SORRY DUDE I HOPE YOU UNDERSTAND :D:P FROM LOLPICKET
you can't.
Latias is a Pokemon that was introduced after the release of Pokemon Crystal, and you cannot trade between those two games, therefore, you cannot obtain it.
you use the regular trade cable you have to talk to the special person who lets you trade to the past (rby) on your crystal. NO PICTURES FOR YOU
You can't trade Pokemon between GameBoy Color and GameBoy Advance. Sorry.
Unfortunately, no. Trading is not available between the Gameboy games and the Gameboy Advance games. It's part of why they released Fire Red and Leaf Green, making all the Gen I Pokemon available for Ruby/Sapphire/Emerald.
In the Ice Cave between Mahogony and Blackthorn.
It switches between the two regions you can go to.
No you cant sense crystal is a different reegion then pearl,diamond and platinum.