There nowhere. After that all you have left to do is to catch mewtwo and that's it unless you want to do battle tower or something.
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You have to beat team rocket in Silph Co
its in celadon city . in the game corner talk to the guy who is covering the poster and he will battle you.then beat him and click on the poster and then stairs to the basement will open. go down . Good Luck
catch diglet or dugtrio or just go see bill and go past the house that was blocked by police, beat the rocket and you get it after you beat him
whenever u beat team rocket at the warehouse in goldenrod
after you beat the fire gym then walk out and your rival will give it to you.