To get to Crystal Lake, one must pass through the Crystal Cave, and at the end of Crystal Cave, there are different crystals, each in a variety of colors. When all of these crystals turn blue the Crystal Crossing will be unlocked.
Azelf, with Grovyle, is waiting; Grovyle is forcing Azelf to give up the time gear. Azelf refuses to relinquish the Time Gear, so Grovyle eats Azelf in order to take it by force.
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