I figured it might be fun to talk about some recent boss battles (perhaps from the past five years?) that really resonated with us and were enjoyable. If it requires it, please put the boss battle in spoilers (but do mention the game, so they're not just a spoiler with no warning of what is being spoiled).
Star Fox Zero final boss spoilers:
For me, it's the encounter with Andross in Star Fox Zero. At first I was struggling with it, because he can be a real pain. However, once I got more comfortable with the dual screened system, I ended up doing well.
The boss fight starts with you outside a column where Andross hides. He can shoot a myriad of lasers that rotate with the column, requiring you to dodge while looking at the TV screen. To get inside the column you have to use the alternate screen to see where the holes in the column are and fly inside to face off with Andross. I just used the GamePad screen to maneuver myself into one of the many available holes.
Once you reach the inside of the column, you enter Chicken Walker mode to strafe around Andross's fists' attacks, such as a slap or a slam. However, if your lasers are strong enough, you can destroy a hand when it readies one of its attacks. Doing this for both hands will have Andross charge up energy, requiring you to exit the column in a quick fashion or take lots of damage.
Once he does the laser attack again, you can once again go through one of the holes in the column to take on Andross's head. He does different attacks like a well-choreographed bite attack, but it's when he opens his mouth to unleash a series of flying debris that you can shoot down and avoid that you can shoot him. Eventually you'll daze him, allowing you to enter Arwing flight mode, fly around to Andross's rear and shoot his weak point.
You have to daze him twice, because I have never been able to defeat Andross in just one pass. Anyway, when that is done, a new phase will begin where Andross chases you. The Arwing flies forward with the view facing the front of the Arwing and a pursuing Andross near behind. He'll signal when he'll lunge his giant head at Fox through the corridor, having you move to the other side to evade.
Soon, James McCloud will swoop into the scene, distracting Andross enough for the big bad ape to turn his head completely around. You can either keep going forward, or you can get ten bonus hits and the Mission Accomplished message by pulling a U-turn and blasting at Andross's exposed weak point to finally put the kabosh on the mischievous monkey. Yay! Game completed!