Ruby, Sapphire, and Emerald are the only games where they introduced TWO bicycles, each with their own features.
There's the Acro Bike, which, although slower than the other one, allowed you to do tricks and even "hop" on.
And there's the super-fast Mach Bike, which is fast enough to go up slopes and ride over cracked tiles.
Personally, I found it pretty annoying having to switch bikes whenever I needed the other one. D/P/Pt had just one Bike with two gears. So, it's possible they could re-introduce this, by making the Achro bike the slow gear, and the Mach bike the fast gear.
And then there's also the roller skates. The roller skates are a very good alternative to the Acro Bike, and I actually think it's what GF should do:
So, do you think that GF will do? Will they re-introduce the two bikes separately? Will they have one bike with two gears? Or, will they just stcik with what we already have and keep let the ordinary bike replace the mach bike, and the roller skates replace the acro bike? Or do you think they'll do something completely different?