If I am correct,you need a good tweak to get to the flower paradise.Once you have sucsessfully made the tweak,use the explorer kit,then the game will restart. then you will be at the snorlax rock{sunny shore city}than keep on going up then you will be at the seaside path.than undo the tweak then use your bike to get to flower paradise
note[you will find shaymin the legendary grass type there.
Floaroma Town
Use Action Replay == ==
Flower paradise is an island you get to by using an event or action replay.You get to it by getting a letter from a green guy from professor oak.The green guy will be in any Pokemon mart.Follow the instructions on the letter to get to flower paradise.It is above the Pokemon league.For better details,get the letter and it will tell you how to get to flower paradise,and that will tell you where flower paradise is.
Flower Paradise in Diamond, Pearl, Platinum
Shaymin can be found on Pokemon Diamond, Pearl and Platinum in the Flower Paradise. Flower Paradise is in the most North Eastern part of the map at the end of Seabreak Path. This area can only be accessed with Oak's Letter which is an event exclusive item.
in flower paradise
go to flower paradise
If I'm correct, the Gracidea flower cannot be obtained in Pokemon Diamond. Sorry! (Note: The Gracidea can be obtained in Pokemon Platinum.)
You can find Shaymin at the Flower Paradise which is only obtained at a Nintendo Event or via a cheating device by acquiring Oak's Letter.
you need action replay to do this as you get a letter from professor oak to go to route 214 and then a bang happens and shaymin comes out of flower paradise
shaymin is a special event Pokemon, fairly weak, and no you can't. you have to get like oak's letter or somethin and u get teleported to flower paradise. this is what I've heard.
North of the Pokemon league (Take the seabreak path)