Woe, fucked up childhood upon Giovanni
Giovanni's the type of person who, in his childhood, was given a cubone by his mom, who fully intend for him to get fed up with such a fussy pokemon and get turned off pokemon training altogether.
And he came home one day saying it ran off and his mom (canonical pokemon hater) reassures him that it's not his fault and pokemon leaves because it's what they do. He in turn would shrug it off saying he doesn't like it anyways so it's fine.
Cut to a bridge over the water and a dog leash tied to the railing, the other end submerged.
(One of the pokemon he has in the game is a Kangaskhan, which could mean anything)
(The Cubone line is Ground-type, which could also mean anything)