You have to get an event or trade or migrate
use a pokeball...
you need action replay Then you can catch any Pokemon i like to use it in platinum and then trade the Pokemon to pearl
You have to use palpark from a GBA game(pokemon)
If you finish the puzzle you can catch the Pokemon unown in the tanoby chambers.
catch all the Pokemon or use an action replay
You can use a Action Reply codes to catch other trainers pokemon.
use a pokeradar in eterna forest
use the pokerader on route 218
a master ball
Yes use your Pokeradar
You ll have to trade from Pokemon pearl or use an action replay
Sadly, you can NOT catch a Poochyena on Pokémon Pearl. Its rather you migrate or you use action replay. Hope that helps!