Oh, and some things I am wondering about:
1) Will you actually hear Red yelling out his commands?
I think his mouth will move and he'll point in the direction your moving, like a soccer coach or something. You will see him yelling but he won't actually audibly say anything. (otherwise they'd have to make him actually say stuff, if he's yelling non-verbally, then he's just yelling "commands".
2) On stages that move like Rumble Falls, it'll be interesting to see how Red keeps up with the fighting!
Yeah, whatever. That's not a question so I can't answer it. Jerk. Use a question mark next time, it's right there under your pinkie finger.
3) Will you be able to access a Female Trainer costume?
I hope so, just like I hope they have a non-hamster Fox, and both ZS Samus and Zelda with Bikini alt-costumes. (hell, they should even throw a bikini on armored Samuses amour, just to be thorough.
4) Final Smash: Pokemon-specific or Red-specific?
I think the Final Smash might be the Trainer throwing out sh!t-tons of pokeballs, in every direction, like grenades.
5) When multiple Reds are picked, how will the Trainers in the background be organized?
They can fist fight each other in the background. Now you have to watch out in two dimensions (two dimensions of 2D fighting = at least 4 dimensions).
6) Continuing on #5, will the different-colored Pokemon wear hats like Pikachu?
Yes, they wear that almost-nike hat that's in the cartoon.
7) Will a lack of stamina result in HP damage, or just make the Pokemon dizzy, etc?
I would think that they just have less power after a while. Punches don't deal as much massive damage and all that. That's how stamina effects me anyway. But if I over exert myself, I do start to feel dizzy.