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Couldn't decide which idea to roll with so I just wrote them all.
>COMBEE's three brains are each designated to a different purpose. One for navigating the trio to flowers to collect nectar, one for converting that nectar into the sweetest honey possible, and the other for self-defense. COMBEE caught by Pokemon trainers for battling purposes may become agitated and stressed over time as only one brain is kept active.
>Despite living under a monarchy in the hive, Combee actually make decisions based on a democratic vote between the three heads. It just happens that the vote is always unanimously to 'do whatever VESPIQUEN says'.
>VESPIQUEN releases pheremones to control the COMBEE in its hive. These pheremones increase in potency in the presence of rival VESPIQUEN. In highly competitive environments, these pheremones can even begin to influence other Bug type Pokemon to defend the Queen.
>VESPIQUEN usually call upon their hive of COMBEE for defense, but in desperate one-on-one situations will use their grubs in combat.