Gyrados is in the Beach Zone, but before you can get there, you must defeat Venasaur's Task, and enter the meeting place. Then you have to finish tasks to get to Gyrados.
It's also possible to catch it. Beat it the same way as a normal Garados..
garados
your a fag
use a super rod
dratinidragonor garados
Rikou isn't in pokepark
No yanmega is not in pokepark but flygon is
well there are no common shiny Pokemon in heart gold but i have seen a shiny garados's and a shiny medapod. so maybe garados.
Yes it does, right when it evolves.
it's not in pokepark 1.
It is at the Lake of Rage in the middle of the lake. You will have to surf to catch it.
a shiny magi karp will