The Pokemon that was the most hardest to find in platinum (with my theory) was palkia and dialga (there in the same place together when found)
Also it is hard to catch mespirit considering its on the loose and changes place everytime. If you beat the game completely then you might want to go talk to professor oak who is in eterna city on a visit and he will tell you about the 3 ledgendary birds which will go on your map (like mespirt) and you can then catch them. (zapdos , articuno , and moltres) they are not easy to catch so good luck!
breed an electabuzz if you want an elekid in Pokemon platinum
You can't find Vibrava on Pokémon Platinum
where can i find the second gym in Pokemon platinum
starter Pokemon
You can find a Shell Bell at Hearthome City in Pokemon Platinum.
The easyest Pokemon is scizer and the hardest Pokemon is milotic.
the hardest Pokemon to find is regigigas you can only get him after finding all the other Pokemon and you can find him in the hippodow temple
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
latias
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
feebas