You have to have obtained a bike from the bike man. And to do that you have to save him from team galactic. Once you have obtained the bike, select bike in your bag, then choose ride. You see, you have to be riding a bike to get down the path.
get to fuchsia city go down and you will be in Route 19
Get an Acro Bike and hold down B while moving.
go down to the pokemon fan club near where you get your 3rd badge talk to the old man about his rapidash hell then give you a bike pass take that to the bike shop owner then you have a bike
The Pokemon mansion is in Route 212 which is the route coming down from Hearthome city. (This will help if looked at on the town map as well).
go down at pewter city
You go down to the city and talk to the guy that brags about his pokemon. Hell give you a bike voucher and go to the store. He will give you a bike.
Its from the left of Viridian City down route 22.
you get him in milstration cave, which is down the river on route 6.
To get to Resort Area you need to the following in platinum - Beat the Pokemon league - Ride the boat from Snowpoint city to the Fight Area - Record all 210 Pokemon in your Sinnoh pokedex - Get the National pokedex form Professor Rowan - Ride across west from Fight Area to Route 230 - Continue riding across form Route 230 to Route 229 - Walk, Run or Ride your bike down from Route 229 to Resort Area There you go I think that all
No it isn't there it is in route 215 if not they broke it down
route 222 is the route you go down to get to sunnyshore city ,but you can only get there after doing team galactic`s veilstone building
After you do the second to last gym it becomes available