You get a diploma and a gold trainer card.
I dont know what happen in diamond, but in platinum you can catch ! and ? unowns.
you have beaten the game and that's it.
go to ever grande city and defeat Pokemon league. affter that go find these legendarys listed.rayquazalatiosregi'iceregirockregisteel.after you are through with that then go catch every Pokemon possible in Pokemon sapphire.after that trade with Pokemon ruby to get the Pokemon only in ruby. Then buy a gameshark for GBA. you need it to get Pokemon from difrent regions such as lugia ho oh celebi -etc. when you have every Pokemon from these regions,hoen,jhoto and kanto then go to lilycove citys game editor. he will give you the diploma. you have then beaten the game.
you've gotta be crazy if you think someones gonna write all the Pokemon you can catch in diamond
catch all the Pokemoncatch all the Pokemon
catch all Pokemon
CATCH THEM AND TRADE FROM SAPPHIRE
catch em all or dont
you don't need to catch them just see all the Pokemon in the hoenn pokedex
yes u can all u have to do is get a link cable and trade Pokemon u cant catch from the other game to ruby.
Use pokeballs.
If you have enough inventory space.
nothing happens
If I remember right, its Latios,Rayquaza,Deoxys,Jirachi, and Groudon.
u get shot and die than team rocket steals ur Pokemon
you must trade from leaf green, fire red, saphire, or ruby
Nothing.