You have to catch at least 60 Pokemon and you have to beat the elite four including your rival
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You can't catch Charmander in Pokemon Diamond. You have to import it from Leaf Green or Fire Red.
You have to have at least 60 different kinds of Pokemon on your pokedex then go talk to professor oak. your rival shall also appear and he will give both of you a national pokedex.
you can transfer from fire red or leaf green but it is easier to go to route201 and use the pk radar but both require the national pokedex
migrate from these Pokemon games ruby sapphire emerald fire red and leaf green requiers national pokedex (only migrates 6 Pokemon a day)
gotta catch it first