User blog comment:Phantom R/It's like a Puzzle... all other character promos./@comment-3347644-20110602185239/@comment-5151799-20110602225719

Well, in the movie summary from Amazon.com, it was noted that Perry was captured when trying to save Phin and Ferb from Alt. Doof when they stumbled through Reg. Doof's Other-dimension-inator (which is always when Perry presumably reveals his identity), after which P&F team up with their alternate selves to rescue him. Therefore, Perry would be quite central to the plot and kind of the driving force for our heroes, thus why he is advertised so much. Platyborg on the other hand, the 2nd Dimension Perry, isn't advertised so much as his counterpart, possibly because he isn't all central to the plot as other characters.

Or, then again, Platyborg could just be regular Perry who was transfigured by Alt. Doof into a minion of sorts, and the promotions just feature Perry rather than Platyborg because they are the same person or they don't want onlookers to think that Platyborg was of creation from before Perry, or... Ugh, I'm making no sense! >_<

Eh, whatever the reason, Disney just doesn't want Platyborg in the majority of the promotions. Maybe they think he's ugly. I dunno. (Oh well, at least he's on the soundtrack cover...)