Weaken it to red hp, paralyze it, use loads of ultra balls or premier balls to get it.
You catch Raquaza in the Sky Pillar on the island near Pacifilog City.
Catch raquaza
Sky Pillar
no you cant get rayquaza
catch raquaza
depending on the game there r certain Pokemon u cannot catch like say on emerald u cant catch palkia or dialga so on diamond u cant catch raquaza sorry
you can i think. i have to ask my friend again.
you need the Pokemon modifier cheat
get heartgold beat it get kyogyre and get RAQUAZA
Unless you cheat it is impossible.
Not in Platinum but in HG/SS you can
Just keep pressing a in different patterns until you catch it