in what pokeball come dialga palkia giritina in heartgold

Question

pokeball masterball and so on

Answer 1

do you mean the event where you use the arcues?

there in normal pokeballs

Answer 2

Yeah you're right hydreigon but there's something little i can add.

If you choose Giratina spot (so you get Giratina) you will get a level 1 Giratina With item Griseous Orb.

If you choose the spot where you get Dialga you will get a level 1 Dialga holding item Adamant Orb.

Same with Palkia, If you choose the spot where you get Palkia you will get a level 1 Palkia holding item Lustrous Orb.
But as hydreigon said, Giratina, Palkia and Dialga will be in standard red and white pokeball.