As the title states. 

If you could only choose to get games from two Devs only, but get them all, which two would you choose?(if they publish games that other devs make, you get those as well: EX: Spike Chunsoft developed Conception II, but ATLUS published it. So if you chose to get ATLUS games, you also get Conception II)

I would personally choose Nintendo and ATLUS. 

Nintendo - They provide almost every genre and I enjoy almost every single Nintendo game. They also have Fire Emblem and Xenoblade. (I am a huge RPG fan with Fire Emblem being my favorite)

ATLUS - Well, they are RPG masters. So it's obvious why I would go with them lol

Things I would be sad to miss out on - Monster Hunter, Elder Scrolls, Witcher... lots of RPG's :(

I said devs in the OP. And if they happen to publish other games, you get those as well. 

paradox interactive and nintendo

Nintendo (because Nintendo)
Namco Bandai (Need those Tales of games)

Square Enix and Ubisoft ...

I can't live without Deus Ex, Final Fantasy, Far Cry and the other good stuff that Ubisoft will be releasing in the future ...

Atlus

Paradox interactive

Square Enix & Atlus.

Sorry, but I'm kinda confused. ._. 

Naughty and Dog!!!

It's only one (well two teams, under 1 banner...) this is all I really need since I have limited time for gaming, I'd rather it be amazing every single time!

Well, because you said publishers, I guess I would pick sony and rockstar.