I wouldn't be so quick to say that it couldn't happen due to iOS being a non-Nintendo console. Early on in Pokemon's history, there were a few games for the Sega Pico. Sega wasn't just another company; Sega was Nintendo's biggest rival (again, this was early in Pokemon's history, before Sony and Microsoft were big in the game market), and there were Pokemon games on its console. Years later, once Sony and Microsoft did enter the market, there were more Pokemon games on the Sega Pico Beena (a different console).
Aside from Sega, there are also Pokemon games on the PC, as well as online.
I wouldn't cross your fingers for a Pokemon game on the Xbox 360 anytime soon, but iOS wouldn't be too much of a stretch.
"Spend a little time each day tricking out your obituary."
-Me