Well it´s not in this forum sooo here what you must to do:
(raped from ashman_kae post)
Ok so heres how it works...
first go to Classroom 1-2 and trade a little girl an EnergBom K chip for a DublShot C Chip
second go to Aquarium HP and trade a grren navi a PnlRetrn * for a Geddon A Chip
third head to the first room of the Aquarium and there is a boy there who wants to trade his HiBoomer V for your DublShot C
fourth head to the WaterMchComp(I think this is the Water vending machine if I remember correctly...) and trade a pink navi your HiBoomer V for a GrabRvng I
fifth head to Central town and beneath the Airbus station and trade a Barr100 H for an AirHocky M chip
sixth is optional at this point(but head to sky town regardless...) if you go to the AirCndtrComp a girl navi wants to trade you her AirSpin2 L for an AuraHed1 B
seventh(almost done!) go inside the Sky Town Cmnd Center and there is a woman there who wants to trade(wait...maybe you can guess) your GrabRvng I for a BigBomb O
Eighth(ahhh...at last...) go to ACDC Comp or Jack into the squirrel and trade a Navi your...you guessed it...your BigBomb O chip for... the long quested for JustcOne J!!!
WooHoo!!!
Muramasa is the 84 and i don´t remember where i get it.
I don?t use action replay to get *insert rare item, shiny poke, rare chip, etc.* i got it legally and right.
And also
Join team Pokemon Masters