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I reckon there is actually a competitive way to use metronome.
Instead of spamming it, it is used in cases of emergency when the rest of the pokemon moves won't really be effective and switching isn't relly an option.
Than, it's a gamble button. there is a chance the move it will bring will change the flow of battle. it is a very slim chance, but it is still more than nothing, as long as such a move rreally does exist.