If trading and your friend has got a really good pokemon that you really want then you catch yourself a really bad pokemon (ie. level 3 rattata). Then trade the good pokemon for Rattata. Then just before it says trade completed when the screen goes blank, turn the other persons Game Boy off. When it says trade completed on your screen turn yours off, turn the Game Boys back on and both people will have the good pokemon. But no-one will have Rattata.
(Do not turn the Game Boy off With the Rattata first as both people will have Rattata)
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