you can appear as if you have joined them at a point in the game going to the radio station in golden rod city, but you can not join them, (also the man find out you are not team rocket and battles you). so no you cannot become a member of team rocket.
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No
you have to beat team rocket in goldenrod city
After you beat Archer (The neo team Rocket Leader) the directer gives it to you
you cant, AVADA KADEVARA, HA.
there are no team galactic grunts in that game. only team rocket, and they are not at lake of rage.