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Double Battles. Of course, not every battle will be a Double, but having the player switch between the two formats while taking even a little care into how the NPCs fight to fit their respective ones will force the player to be prepared for both playstyles and reduce the chance of cheesing every battle with one specific loudout kitted to either format. In addition, when you're in a Double Battle against a computer you have twice the choices per turn to win with whereas the NPC, being AI, cannot handle the same synergies dynamically. This means you can give the NPC a harder overall setup while still allowing the player an upper hand to fall back on.
