Yous should have flash now. Take the boat back, and use flash on the cave where you couldn't see before, and then you go to Mauville City.
go save the persons bird and then he will take you to his house ride it
the first gym you stated with
go to the galactic building in entera city
Go to Evergrande city,
Make your way through victory road,
Challenge pokemon league
Ever Grande city
the fifth gym on Pokemon diamond is the one in herthome city,
To the fifth one dah
After you get the HM and earn the Fantina in the Hearthome City Gym
go to the teAM GIGLATIC building and beat everyone inside
You have to beat the gym leader gardenia then cut the trees in the top of the town beat every trainer and võilá you can get a bike
Use a fire pokemon. That's what grass is weak against.
you beat the gym leader
The Pokémon the second Gym Leader has in "Diamond" are Cherubi, Turtwig and Roserade.
beat the #?*@! gym leader
what did you say
After you beat the gym
you beat everyone in the gym
beat the league
make your grass type learn other moves
the best way to beat the 7th gym leader is with a fire type Pokemon
With good Fire of Fly Pokemon!
train your Pokemon to about lv 20