I can not get to acuity lake front on ninten do ds (pokemon diamond)

Lake Acuity is to the east of Snowpoint City, and you pass Acuity Lakefront on your way to Snowpoint City from route 217.

Your question is unclear but if you are asking what Pokemon is on the cover of the game and is the one that you will be able to capture, it is Dialga.

The only way to get a prinplup in pokemon diamond(besides trading with a friend of course) is to evolve it from a piplup which can only be achieved by choosing it as a starter pokemon

play all over again

Yes, the walk through walls cheat can really scrue up your game,

when i used it, one of the lakes got drained for good and there is a bunniery girl standing in the middle of no where

do you mean migrate pokemon from a gba pokemon game to diamond because if you do that you need to complete the sinnoh pokedex by seeing every pokemon in the sinnoh pokedex and then you can go to the pal park. Then put the gba game in the gba slot. Start up you diamond and on the menu there should be a sign that says, "Migrate from gba game"

try pokemon pearl it's pretty much the same thing and when you get diamond fixed you can palkia and dialga on either game

UUUUUUUUUUUMMMMMMMMMMM WHAT DO U MEAN U GOTTA GET A POKEMON DS GAME U CANT PLAY IT FOR FREE ON THE COMPUTER

you will go to the left of jubillife city

Here this should help you =).

http://www.youtube.com/watch?v=o0ifxcXgeZU