Speaking of continuity, from what I understand, the Showa Riders are all in continuity with each other (obviously), Kuuga is in continuity with Agito (at least, that seems to be what's widely accepted), and W, OOO and Fourze also seem to be in continuity. Fourze also implies that both Kuuga and Ichigo existed in its universe, therefore it can be assumed that at very least, the entire Showa era, Kuuga-Agito and W-Fourze are all in the same continuity.

The questionable parts seem to Ryuki-Decade, and then Gaim. I can't really comment on Wizard or Drive.

Is this all correct or am I missing something?

Continuity is wonky, with Decade trying so hard to establish a "Decade continuity" that it goes so far to say that Black and Black RX are not the same person.

The Ryuki through Kiva don't really have a continuity to speak of, often times their story events are literally impossible to occur in other series outside of their's. They're more just stand alone characters, while Decade through Fourze have a tenuous connection through Foundation X.

Did Foundation X already appear in Decade? I though it wasn't until W till they were mentioned.

Foundation X first appeared in Double that is correct.

Oh hey was kick and hopper beating up decade just for kicks that one early episode? It threw me off since they had voices and such.

I dont really understand your question :lol

*Shrugs* I was one series off.

I haven't seen Black RX yet, but didn't they have a special where Kotaro split into all four of his forms? That could be the case....I guess?

Sorry I edit it I'm on my iPhone in class right now :lol

So expect odd misplaced words due to auto-correct

Punch and Kick Hopper always had voices.