first get jarachi/groudon/kyogre/lugia/ho-oh
and say farewell to all of them.
(don't worry whit this cheat you will get them back)

go battle them again and recruite them,then say farewell and all pokemon will have 99.9% chance that they will join.
(you can't have a friend bow,link cable,reviver seed,joy seed or tight belt whit you when your doing this cheat)

it worked for me and now i dont want game shark any more!.