You should use a Master Ball or a ton of Ultra Balls and you might get lucky.
A quick ball would be helpful for the first few turns if we're talking platinum.
A master ball
The best ball to catch Deoxys is a Master Ball or a Timer Ball! Trust Me!!! Pokemon Master
Dusk balls
A regular pokeball I'm not playing I caught entie with it jk the best one is a master ball but I did catch entie with a poke ball
you catch it with a poke ball
master ball
with a poke ball
by throwing it
use a poke ball
the ultra ball is what i used to catch it...but you could use the master ball after you get it
To catch a pokemon, you require a Poke ball, which you can buy from a poke mart.