no
onlyin the battle frontier
No.
no you can't find a torchic egg in Pokemon platinum
The only way to get torchic in platinum is to have a ruby or sapphire or emerald game migrate one to platinum then catch it at the pal park.
a trainer has one in battle tower
no one
you can see one in the battle tower (when you get nat. dex) but it wont show up in your dex. the trainer would have a cydaquil, charmander and torchic.
Pal Park
Sure.come to my house.
There is no trainer in platinum that is willing to trade a munchlax.
Sorry but there isn't a trainer with a bagon in platinum.
you can find the trainer with the misdreavus in platinum in hearthome city i believe
no one no trainer has a kingdra in Pokemon platinum exept for me :P