To beat Balteus in Armored Core 6, the key is to use a pulse gun to break his shield by getting in close and attacking aggressively. Once the shield drops, Balteus will be staggered, and this is the time to assault boost with a plasma blade or sword to deal heavy damage. Avoid missile volleys by quick boosting away, and watch out for his flamethrower and cannon attacks, especially when his health drops to around 40%. Maintain pressure while dodging his attacks, and use missiles or shoulder weapons to chip away at his shield before moving in for melee strikes.

Best Build Tips:

• Right arm weapon: Pulse gun (for shield breaking)
• Left arm weapon: Plasma blade or sword (for close-range damage)
• Back weapons: Missile launchers (to chip at shield and health)
• Legs: Bipedal (for good mobility)
• Booster: Prioritize quick boost for dodging
• Arms and core: Prioritize armor points for survivability

Battle Strategy:

• Start by using the pulse gun at close range to quickly drain Balteus's shield.
• Once the shield is down and Balteus is staggered, move in with a plasma blade combo for high damage.
• Dodge the incoming missile salvos by quick boosting out of their path.
• When Balteus drops to about 40% health, back off to avoid his shield recharge burst and follow with dodging his dangerous flamethrower attacks.
• Stay in medium range to use missile launchers and plasma rifles effectively, and close in when safe.
• Keep an eye on his cannon attack after he shifts position, and avoid damage by timing quick boosts.

Additional Tips:

• Staying close to Balteus reduces the effectiveness of his ranged attacks.
• Accept some chip damage to maintain pressure.
• Use quick boosting smartly to avoid heavy damage attacks.
• Carefully watch the boss's attack patterns and attack openings after missile barrages or cannon fire.

This approach provides a balance of aggressive shield-breaking tactics and cautious evasion to outlast Balteus and deal consistent damage until victory.