This really isn't the place to continue this discussion, so I'll just leave it here.
Supposing Decade is actually from the Real World, there was a Nega World, which was basically, the negative of it.
Tsukasa isn't from the real world, he's from an AR World too. His sister is an alternate reality counterpart of Bishum, after all.
The saddest part of Decade is Real Kiva trolling the **** out of Tsukasa. They never tell him of his power, or what he's supposed to do.
That wasn't sad, Tsukasa pretty much only survived due to that. If Decade had just killed the AR Riders without ever befriending them, he'd just have disappeared when he had finished his mission and were killed by the real Heisei Riders or someone else. He only survived in the end because all the people he met during his journey remembered him as a Rider, an hero. That was Decade's "story", something he wouldn't have if he had just continued as a villain.
after he had been to Stronger world (Like in that magazine) to "kidnap" Tackle
Tsukasa didn't kidnap Tackle, she was the one following him while he told her to leave him. Also, considering how the movie makes it clear that she died alone and no one remembered her, that Tackle featured in Movie Wars 2010 likely came from some world where she was the only hero.
I would really like for this to be picked up by another Rider furtherly, and explain what the hell the pre-DCD Riders are/were fighting. They really don't appear to be engaged in any causes right now, as oposed to Showa Riders, who are still fighting.
Fourze's official site says that every Rider is still fighting in different locations, it never specifies just the Showa Riders. They only happened to be the ones that got to appear in Megamax due to the whole 7 Legends theme they had going on.
What I want to see out of the Fourze & Wizard Movie War is that if they can tie the three acts together like what they did in Mega Max.
I'm hoping the 10 first Heisei Riders get to make a 7 Legends type appearance in the next Movie Wars, but I don't think that's likely...