I might be late on this, but...

[Mario Super Sluggers]

In Wii Sports Resort, we can now do 2 vs 2 matches on the following sports.

Frisbee (Dog, but not sure about Golf)
Archery
Basketball (3-Point Contest)
Golf
Bowling

 

[Paper Mario the First]

Players couldn't do this before? I never played the game; I'm just wondering.

 

[New Super Mario]

I have the game, but I'm not checking at 9 o'clock at night

 

[Mario Super Sluggers]

Players couldn't do this before? I never played the game; I'm just wondering.

It was not an option in the first Wii Sports.

 

[UltimatePetey]

Players couldn't do this before? I never played the game; I'm just wondering.

It was not an option in the first Wii Sports.

It should've been..