You can't and are not supposed to; they are boss pokemon and belong to another trainer.
Update: YOU ARE WRONG U CAN CATCH THEM AND THEY DONT ALL BELONG TO OTHER TRAINERS (u just gotta hack)
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you have to go to route 12 [i have no idea which pokemon to use]. hope this helps!
yes
with pokemon
meowth. persian
No, but you could get porygon2 in PTD2, but you have to wait until you could be able to transfer pokemon from PTD to PTD2, and you need the dubious disc to be able to evolve Porygon into Porygon2 in PTD2!