All you have to do is steal a tyranitar from a trainer that has one using the thief cheat or find a pupitar and evolve it.
You can't get the Pokemon in Pokemon Platinum.
there are none only grond type ones.
Infernape Golduck Rypherior Sceptile Tyranitar Electivire
First it's larvitar then it's pupitar and then it's Tyranitar
Larvitar evolves into Pupitar at level 30, then finally into Tyranitar at level 55.
You find larvitar in seavault cannyon. and then you evolve him into pupitar and tyranitar :) check serebii.net if you're wondering.
It is shiny, you are really lucky to get one of those, one in like 8000 chance
buy the Pokemon platinum book
The 151st Pokemon is Mew and is unobtainable in Pokemon Platinum.
Tyranitar isn't anywhere in the wild in Pokemon FireRed. You will need to evolve it from Pupitar. It is required to get a Larvitar first, however; it is in Seavault Cave and can evolve into Pupitar at level 30, then Pupitar into Tyranitar at level 55.
no you can't find a torchic egg in Pokemon platinum
Tyranitar is a shadow pokemon, and it's level 55.