>A brand new feature to Pokémon Omega Ruby & Pokémon Alpha Sapphire is the ability to have both bikes at the same time. This is necessary for getting some items in a variety of areas including the Safari Zone and various Mirage Caves. To get both bikes, you need to advertise Rydel's Bikes to various people throughout the region
>Mach Bike - Show the Mach Bike to a Hex Maniac in the Route 111 Desert
Acro Bike - Show the Acro Bike to a Bird Keeper in the Acro Bike area of Route 119 - Requires Surf & Waterfal
Any Bike - Speak to a Triathlete in Battle Resort
>Once you have spoken to all three of these characters, return to Rydel's Cycles in Mauville City and he will give you the other bike, so you now have both bikes at the same time.