You need to watch TV and see if there is an outbreak of Pidgeys in route 229.
You can get pidgey in pokemon diamond by going to your friends house and talk to the mom and go to rout 229 and yous a pokeradar.
I go with feebass, bidoof, magikarp, metapod, pidgey, and ledian.
You Can't
you go to the Pokemon mansion under Hearthome City and go out into the garden. Use the pok'e radar there.
capture the legendary and train your Pokemon
You actually cant physically catch a rayquazza in diamond or pearl. If you have diamond or pearl and you want a rayquazza you need to get pokemon emerald capture it on there and then migrate it onto your peral or diamond game. Cheers boiz and gyrls.
It's on route 228.
capture one in the safari zone
in snowpoint cave somwhere
you cant find a pidgey in Pokemon emerald the only way to get a pidgey is to trade with Fire Red or Leaf Green
Pokemon on Pokemon diamond are like any other Pokemon, little creatures that you capture, battle with and train. To find some you just got to go looking?
cant fight just capture