There are three different Ruby Destiny games - Reign of Legends (#1), Rescue Rangers (#2) and Life of Guardians (#3).
I haven't played Life of Guardians (my sister does, so she should know if you can actually get a bike or not), and I don't exactly think you can get it in Rescue Rangers, because RR is virtually Pokemon Mystery Dungeon -___-" In Reign of Legends, you get it in Destral City (AKA the place where you find all the contest halls).
where is Destral City-___-`"??????????!!!!!?!?!?!
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Pokemon Ruby Destiny Reign of Legends ,Pokemon Ruby Destiny Rescue Rangers, Pokemon Ruby Destiny Life of Guardians
In the game Pokemon ruby destiny
Where to download pokemon ruby destiny life of guardians?
The 6th Gym Leader In Pokemon Ruby Destiny is in Down Pour City
you get it randomly