To get in the library in Pokemon Platinum, simply go to Canalave City and enter the library in the northwest from the Pokemon Center.
In Pokemon Platinum you dont get the key from a grunt you get from the detective, before getting the key you have to go talk to prof. rowan in the library .
canalave city west of twinleaf town (i think)
Go to the library top floor
at lake Verity.
Beat all the team galactic guys at the three lakes of Sinnoh.
There is no rental Pokemon in in Pokemon platinum
You cant get Pokemon from Pokemon ranger to platinum!
how to get a togepi in Pokemon platinum
There is no grunt that you can give a Pokemon to in Pokemon platinum.
You can't get palkia in Pokemon platinum. You have to trade it from Pokemon pearl. But it's registered in your pokedex when you go to the library in celestic town and read the book. You can also use pokesav.
buy the Pokemon platinum book
yes there is a new Pokemon in Pokemon platinum. its name is Arcues.