Wake is best beaten with Grass/Electric types. If you are struggling you can buy Thunderbolt from the GameCorner or if you have enough shards you can buy Thunderpunch just outside Pastoria.
Go to Hearthome City. Although first you have to beat Mayleen and Crasher Wake. After that you can challenge her. You don't have to beat Mayleen and Crasher Wake in Pokemon Platinum. -
crasher wake is in pastoria city
somewhere in a bridge whre the safari zone is located and in stark mountain
its ez
Crasher Wake is in the very back of his gym in Pastoria City. He is a user of Water-Type Pokemon.
gyarados
surf
talk to wake at the entrance to the great marsh
After you beat him, continue on with the game. I think you run into Barry after you beat him, or it might be before..
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garidose,flotazel and quaza.esey pesey
to verity lake