Deboss has been wandering around the universe destroying planet after planet though with continuity, I don't know if he has ever clashed with the Zangyack or any other toku space villain that I can't think of. Earth was just gonna be one of his many planets he targeted.

To be honest this pleased the shipper in me.

Deboss was essentially just a big bomb that was created by another being we dont know yet. His purpose is to destroy the population of planets.

The Emotions arent really Food for Deboss. He needs the emotions of the dominant species on the planet to further his evolution. Thats how he gets stronger so once he achieved his human form he wouldnt need the humans anymore.

I doubt he clashed with the Zangyack since he arrived and subsequently lost on Earth during the time of the dinosaurs.

Glad you see it the same way I did :)

Ah well I assume that the Zangyack has been around like forever and while Deboss was in space so they might have clashed.

Whoa, really? Another being? I totally missed that. When was that explained?

He told it to Daigo during their final battle.

Ok, so as I understand it, Deboss can't destroy a species until he understands it full? And to do that, he needs to obtain that species' most potent emotions?

So he's sort of like an emo Brainiac. Got it.

I wonder if they'll ever address the fact that he was created by another space guy. Maybe that'll play some part in one of the VS movies.

I would guess so.
It seemed to me like really obvious build up to the V-Cinema...but again I also thought the Presenters in Kamen Rider Fourze were obvious build up for Movie Taisen Ultimatum :lol