Shield, shield reflect, air time, dash
AOE incapacitate, push, stun, projectile reflect
Good damage input
Space dependant for aggression
Bad orb control
Better on 3v3, based on damage reduction and peel for allies.
Better on 2v2, objective here is to aggression, better play it with a Ranged and try to destroy an opponent.
Try to aim and hit as much M2 as you can, since it's your primary damage dealing/bursting ability.
Your E can either be used to engage or dodge abilities. Remember it also cancel enemy casting abilities (such as Sirius ultimate for example).
Space on an enemy having no escape left, allowing you to stick to him and chunking his hp's.
Need to use your E in a wall to stun.
You can aim easily your M2 after exE, even without stun in wall.
At the start of the rounds, try to farm some energy with your M2's, then get into the fight with your R (War Shout). If you get pushed very hard, use your incap and take the middle orb with your teammate.
Your EX-E is a very strong ability in sudden death, use it as much as you can to push your opponent out of the safe zone (use it after they used their mobility skills to guarentee a very good advantage/a easy kill)
Think about the important things to block with your bulwark and make a good use of it to get an advantage over your opponent.
Spam your EX Space as much as you can to start doing spell rotations on them, or just peeling off for your ally
Spam your War Cry (R) to protect you and your ally (if possible) to make it more efficient.
As said before, your orb control is far from being the best in the game. You can always put yourself in front of the orb and blocking incoming projectiles with your Bulwark, allowing your ally to take it safely.
Bakko is very good against Lucie, try to get in melee range and start M1/M2'ing her until she uses roll. Once her roll is down, just follow her with your gapclosing abilities (space and E) and keep damaging her. Watch out for her Panic or Petrify and prepare reacting with your Bulwark.
Try to get in melee range, start dealing damages with your M1/M2 until she uses Otherside. Then you will be able to space or ult on her and get an easy kill. Avoid proking panics or you will lose your pressure on her.
Take the Snare battlerite on M2, try to hit a M2 after her Haste then follow with a Space to start trading with her. (Try to block her Q with your Bulwark, it will stun her and give you a very good lead on her).
Don't waste you bulwark vs RK or you will be in a big trouble, since RK outrades you (more sustain) in a pure 1v1 trade. Try to space on him only if his own Space is down (and possibly his R as well).
Try not to get baited by her M2 cancels. If you can reflect her Snipe everytime you will avoid taking most of her damage. Try to punish her after she uses Space.
She has much control, she can dispell your shield (War Shout). Try to reflect her tazer with your Bulwark and jump on her if she uses her Space.