all pokemon tag team gx cards Latias & Latios-GX | Up Mega Evolution expansion. TAG TEAM (TCG) - Bulbapedia,

Congregate also shows a push from design into thinking about multiplayer through expandable effects

Multi-function removal like Seam Rip, Pinnacle Starcage, Nowhere to Run

Here is the complete card list of SV9a Hot Air Arena: If you are on a PC, you can Right-Click the Image and choose 'Open Image in New Tab' for the bigger picture

This deck could add Red, as there are some "take damage gain life" effects in Red/White also, but it's probably not enough to be worth it

Active Pokmon: Your active Pokmon is your front-line fighter which typically is used as an attacker, or at least a Pokmon card being used to stall your opponent