4th Gen That really grinds my gears!

[NavySealGR]

I think they are the same,they just make a change in the way the bikes function to get past obstacles

 

[PaxAmericana]

I like the fact of having the multiple gear bike, because like numerous people have already replied with: It saves the trouble of flying all the way back to the city in which you got the bike: in this case, Mauville City, switching out bikes between either the Acro or Mach Bike, and then flying back to the respective city in which you were.

 

[Rivvon]

Definitely not as fun as the Mach and Acro bikes, but it was definitely better than having to manually switch the two bikes in Mauville!

 

[Dying Light]

Better than having to switch bikes, but since you can't use it more "universally" like in the Safari Zone, it really is an unnecessary addition, IMO.

The way I see it, is that the high gear's main purpose was to either make hatching eggs faster, or glitching the game to access the Void.