What Two 1st Party Nintendo IP's should have a CrossOver Game Together?

[tbone51]

Light said:

NintendoPie said:
There is already a Nintendo X Sega game. It's called Mario and Sonic at the Olympic Games...

Implying that Mario and Sonic at the Olympic Games is a good game.. 

exactly, its a party game. A 2D side scroller for Mario and Sonic can do cool things imo!