If you never managed to get three of your friends and four GameBoy Advances together to play through Final Fantasy Crystal Chronicles' multiplayer mode, it should be substantially easier to play through the campaign in co-op once the remastered version of the game comes out on January 23, 2020. Launching on the Nintendo Switch, PlayStation 4, Android, and iOS that day, the biggest feature coming to Final Fantasy Crystal Chronicles Remastered is online multiplayer with support for cross-play.
Square Enix first announced the remaster of the 2003 Final Fantasy spin-off last year, aiming for a 2019 release window that the game's missing by a hair. The launch date announcement trailer runs through some other features new to the remastered version, including in-combat voice acting, new items, new character skins, and exclusive dungeons and boss fights.
The original Crystal Chronicles was one of a handful of titles for the GameCube that supported the system's GameBoy Advance link cable for local multiplayer. Simply plugging in another stock GameCube controller for multiplayer wasn't supported, as Crystal Chronicles would display information on the linked GBAs' screens. On top of making it hard to wrangle the necessary gear for multiplayer on real hardware, the game's also been a particular challenge for emulation enthusiasts. Hopefully Final Fantasy Crystal Chronicles Remastered is appropriately faithful and easy enough to use to let everyone put those cables away... unless you're looking to replay Four Swords Adventures, of course. Maybe Nintendo has a similar plan down the road for its four-player Legend of Zelda romp.