I caught one in canlave city.
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use a super rod
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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You can find Pidey in a Pokemon Outbreak in Pokemon Diamond
where do i find a totodile in Pokemon diamond/pearl on nintendods
You can not find or get manaphy on Pokemon diamond but you can by hacking, trading or... if you have Pokemon ranger you have to complete the manaphy mission and then you can put it onto diamond.
You can't find a Ho-ho in Pokemon Diamond. You have to migrate.
To get a Manaphy in Pokemon Diamond you have to get Pokemon ranger and defeat it and you have to trade it to Pokemon Diamond,Platinum or Pearl.
its not a Pokemon
Not really that rare... in Pokemon Diamond you can find Sunkerns on Route 204