use a super rod
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I caught one in canlave city.
You can. Fish for Lumineon in Canalave City by the port with a super Rod, or on Iron Island.
Using the Super Rod nearby Valley Windworks. The Super Rod can be gotten from a fisher (not fishing) at the Northeast Island.
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Pokemon diamond
level it up
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Pokemon diamond Pokemon diamond Pokemon diamond
.... it's a water type fish pokemon, so yes. and the one to use is the good rod on route 218
you cant be a Pokemon in Pokemon diamond
She is not in Pokemon diamond.