catch two magikarps, male and female, train them to level 30 each, both of them MUST be at level 30. however DO NOT let them evolve right away. keep them as magikarps, make them have an egg, then the you will have a red/shiny garydos.
migrate from fire red
You can catch red Gyarados anywhere because red Gyarados are only shiny but are extremely rare.
you cant. You can only do that on platinum):
no you cant you must migrate from fire red, or leaf green.
there are 2 ways. first, migrate it. second insert the fire red and Pokemon platinum, then on Pokemon platinum go to route 201 or 202 and you would be able to catch it without migrating it.
The answer's on my website: www.manaphy-star.webs.com All 6 steps...
to catch shiny mew you have to migrate it from Pokemon fire red leaf green from GBA
on route 204 although you need Pokemon fire red in the gba a slot
you can't catch mew in Pokemon platinum you can only get it by cheats, mystery gift, migrate from a Game Boy Advance Pokemon game like fire red, leaf green sapphire, ruby, or emerald version.
you can't catch it in the game. you have to have pokemon leaf green, fire red or water blue. then put it into the gameboy section. then when you go to the screen it says migrate. then if you caught it in the gameboy game select it and you can use it in platinum.
u have to have fire red inserted in the gba slot that's how i caught it
same chance to catch a shiny gyarados to catch eny shiny in platinum.