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At the end of Let's Go, after you beat the Elite Four, after you catch Mewtwo, Green shows up. You have to trek all the way back to where you found Mewtwo to fight her. After you win, she repeatedly throws Poke Balls at your face, pretending to catch you, then says "tee hee" and runs off. Your character is left standing there with about five Poke Balls at their feet. There's nothing in them, they're just standard Poke Balls. For those of you who haven't played it, I'm not making this up.
The real purpose of Let's Go is to expose basedboys. After spending hours of your life becoming the champion and catching Mewtwo, some bitch throws shit at your face. Are you going to be a beta faggot and pick up those five measly Poke Balls? You didn't pick them up, did you?