You cannot catch Grovyle in Diamond but the only way you can is by having Ruby,Saphhire or Emerald and having Treeko then evole it to Grovyle and migrating it to Diamond if you have Pal Park (south east of Sandgem) but the only way to go to Pal Park is to have the National Dex.
I taught my grovyle cut
You cannot catch Celebi in Pokemon Diamond.
yes, you can catch Pokemon in Pokemon diamond
neither of them is better, they are both the same, but in diamond, you catch dialga, and in pearl, you catch palkia, and you can catch different Pokemon in each game for example: you can catch this Pokemon in diamond, but not pearl but: you can catch this different Pokemon in pearl, but not diamond
You can catch makuhita in the fighting area in Pokemon diamond
How do you get a cherrim in Pokemon diamond.
ucant catch misdreavus in diamond
You cannot catch a Metang in Pokemon Diamond. To get one, you can evolve a Beldum.
You can't catch a Lugia anywhere in Pokemon Diamond.
Nosepass is a swarm Pokemon on Pokemon diamond
you can catch a pikachu in the Pokemon mansion.
You can not catch a manaphy on Pokemon diamond. you must trade it somehow on a Pokemon rangers game.