Super Robot Taisen UX has a partner battle system, reports Famitsu. You can use partner units where you pair a main and sub mecha together to make one unit that moves around and fights on the battlefield. During intermission you can switch the main partner and sub units. The advantage of partner units is they’re more versatile on different types of terrain, but you have a set partner character for support.
Single units can get support from units up to eight squares away, but if no units are around you don’t have a support attack. Another advantage single units get is they can do all attacks and continuous attacks.
Super Robot Taisen UX has a bunch of new mecha too. You’ll see these robots on Nintendo 3DS when the game comes out on March 14.
SD Gundam Sangokuden Brave Battle Warriors
Ougasou Kanu Gundam
Mobile Suit Gundam Seed Destiny
Infinite Justice Gundam
Fafner in the Azure