Why do you want it, its terrible.
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It learns double egde at level 63. Double edge is that last move Aggron learns.
Some Pokemon learn that move like togetic.
buy many pokemon packets and hope you get lucky
As far as I know, it's not a TM.
The move Double Edge isn't available as a TM in Pokemon Leafgreen. Instead, head to the very end of Victory Road and talk to the person near the exit - he will tell you that you've worked very hard and you deserve to have one of your Pokemon learn Double Edge. It works just like a TM, but you can't carry it around with you - it's an in-game thing.