You have to press certain buttons on the menu screen. (The place that shows your file and asks if you want continue.) Unfortunately I can't remember which to push. But, you can see
see what it is by clicking on "new game" and pressing save when you get the chance and it will tell you which buttons to push to delete your save file that you already have.
You can find Heatran at Stark Mountain after 24 hours from getting its data
buy the Pokemon platinum book
The 151st Pokemon is Mew and is unobtainable in Pokemon Platinum.
no you can't find a torchic egg in Pokemon platinum
There's a man in Pastoria City (around the center, I think) who teaches Pokemon forgotten moves in exchange for a Heart Scale (you can easily find these underground).
It's Manaphy and you can get its Pokedex data from a book at the Pokemon mansion below Hearthome.
try your best to find spirtomb in Pokemon platinum
There is not a route 233 on Pokemon platinum.
You cannot find zekrom in pokemon platinum
there is no such Pokemon
you find them in the cave
breed an electabuzz if you want an elekid in Pokemon platinum