Get in FireRed and migrate. Or trade from a friend.
Bagon is only available in Pokemon pearl. You can however catch a Larvatar instead of a bagon. you can trade one for a Bagon because another pearl player will want one.
What is an ...?
you can by getting an egg
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You can't sorry. Try getting Pokemon platinum or pearl.
getting a glitched Pokemon can corupt your game so don't worry about how
you can get it by getting a pichichu in pearl trade it to heartgold
by getting the national pokedex.
It has to be traded from Diamond, Pearl, or Platinum. From there, it can only be gotten in an event, by getting an item or getting the Pokemon outright.
no only in pearl and dimoand
yes you can only do it by getting 999 Pokemon from Pokemon pearl and after you get 999 Pokemon talk to hayley and she will give you a mew!
From what i know you complete Pokemon diamond and pearl by getting all the gym badges, beating the elite four and completing the pokedex. But im not sure if you have to catch all the Pokemon.