I might have missed one though.
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No, you can't battle Maylene and/or Crasher Wake in Heartgold.
Crasher Wake is in the very back of his gym in Pastoria City. He is a user of Water-Type Pokemon.
surf
it's the badge from crasher wake
In the castle wars minigame you do not lose any of your items.It is a safe minigame,all items are kept if you die during the castle wars minigame.