Maybe Waluigi turns out to be the chosen one, and Luigi is upset its not him so he joins Wario. So then it would be Wario and Luigi vs. Waluigi and mario. Id like to see Luigi turn bad. Then maybe his character would develop a little.
Yeah, then it'd be like a Mr. L concept. But Luigi's loyal like that, I don't think it's in his character to do something like that.
But I thought of a funny skit about the Other Chosen One.
Waluigi, Mario, and Luigi defeat Wario and take the Truth from him.
Mario: And now, we will no longer have to deal with Wario.
He raises his beam sword to kill Wario but Waluigi stops him.
Waluigi: Wait, you cannot kill him.
Mario: Why not? He tried to kill all of us!
Waluigi: You cannot kill him because he is the other chosen one.
Mario and Luigi: WHAT!?
Waluigi: Yes, Wario is the Other Chose One.
Luigi: You said your purpose was to protect the other chosen one, why did you help us defeat him?
Waluigi: I told you that Wario had to be stopped and the truth needed to be taken from him. I protected his life and the true number of chosen ones.
(This is where it gets a little off topic)
Waluigi: he he.. well you see there aren't actually 2 chosen ones, there are more.
Luigi: how many more?
Waluigi: There are 7.
Waluigi: Yes, the Chosen Seven.
Link: (appearing) Am I one of them?
Luigi: Link? Where have you been? We thought Wario killed you!
Link: I was travelling through the forset looking for the Artifact with Coconut.
Mario: ... Ooookkkkaaayyy...
Waluigi: Yes you are one of them.
Luigi: And who else?
Waluigi: You are one.
Waluigi: Yes you and I are also chosen ones.
Waluigi: Yes, I protected the other one by protecting my true purpose. I am a chosen one.
Mario: And who are the other two.
Waluigi: One of them is Ash Ketchum.
Ash: (walks towards the group) Alright, I finally get to do something important!
Waluigi: and the final chosen one is Gark Oak.
Gary: Haha yeah!
Ash: Gary? I haven't seen you since October! Where have you been?
Gary: I been better than you Ash! Ha ha ha! I was out catching the rarest Pokemon in the world. What have you been doing? Playing your pokeflute? heh heh heh!
Mario: So these two morons are Chosen Ones?
Waluigi: Yes, they are. Together we are the Chosen Seven.
Ash: Wow, I love saying that! It's so catchy! Chosen Seven. Chosen Seven. Chosen Seven. Chosen Seven. Chosen Seven. Chosen Seven. Chosen Seven. Chosen Seven. Chosen Seven.
Gary joins in.
Ash and Gary: Chosen Seven. Chosen Seven. Chosen Seven. Chosen Seven. Chosen Seven. Chosen Seven.
Link Joins in.
Ash, Gary, and Link: Chosen Seven. Chosen Seven. Chosen Seven. Chosen Seven. Chosen Seven. Chosen Seven. Chosen Seven. Chosen Seven.
Luigi walks over to them.
Luigi: (while they're chanting) STEEAALLIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII