they say that we get in the radio tower batling the team rocket in the final the owner of
the radio tower give it to you

i went o the tower and i did not get it

you get it by defeating team rocket and saving the radio tower. The owner will give it to
you I hope this helped

eu matei a elite four e ainda nao ganhei o clear bell... acho que minha bag tava cheia lá
na radio tower

bag full