A1: You dont have to beat the Early Drill Model with just Deego. I think you mean Gale, the purple haired dude. Guard against his gun and attack ONE AT A TIME. dont use combo unless he taunts u.

A2: Or just use wunder howl it takes 800 off him eyche time

A3: I believe that the part of the fight that you are referring to is the part of the fight with Gale when he is in the Early Model Drilling Rig. You do not have to fight him all alone because, at that point in the fight, both Jaster/Jester and Kisala/Kisara are in the fight with you. However, it is not an easy fight, even with them helping to beat this form of Gale with you. Still, with that being said, it is a cakewalk in comparison to the second part of the fight, where it is Gale by himself with no robot helping him and Deego. Here is the way that I had inadvertently found to beat Gale super easy in the game. All that you have to do is simply stand in the middle of the room. Also, before you begin this fight, did you notice something that was a bit odd about your Subweapon? Yes, it had a special message that read "Invalid Now." Well, what does that exactly mean to you? The answer is quite simple. It means that you have, gasp, INFINITE AMMUNITION, so what you now do is simply fill Gale with enough lead to make a radiation bunker and when he hides behind a rock, simply change directions a little bit and snipe him off a bit more and also be sure to not forget to block his bullets, just like the more conventional way of beating him in this fight, by using your RI button. In short, the R1 and Square buttons will become your best friends here. Sure, your patience might be tested by this much longer battle, but at least it is a battle that is plenty more in your favor than if you were to face him in the more conventional way.