Gaming Co-op or Teams?

[Covarr]

I need a list of some games that support co-op or team modes in download play. My sister tends to prefer teamwork to competition, and that's often hard to find.

So far what I already know of is:
Mario Kart DS
Pokémon Trozei

On a side note, Pirates of the Caribbean: Dead Man's Chest on the DS is actually a good game, despite the usual sub-par quality of other games based on Disney movies, and it also has a good co-op, but that requires multi-card.

 

[Kurai]

I reckon Metroid Prime: Hunters should be Co-op like walk through Single Player together like you can on Halo 2, That'd be cool

 

[phoood]

I believe Tom Clancy's Splinter Cell Chaos Theory has co-op. But I've never got into it because it was slow as hell when I played.

& Resident Evil: Deadly Silence

 

[Qpido]

Isn't the new Castlevania: Portrait of Ruin also available in Co-Op?
That would be pretty awesome.

Q~

 

[Covarr]

Thanks. I will check these out.

Any more suggestions?