Gladion so similar to gladiator.
His pokemon is a mythical beast that
wears a gladiator's-like helmet.
It is/will be used to battle THE mythical beasts.

Do i see a pattern?

also aside from the official sayiing that
explains that the helmet is used to nerf
type:null from being too OP, i like to thing
that the head is a ghost (type) pokemon and
the helmet is keeping it in touch with the
rest of the body. like a seal of some short.
how cool would that be.

i hope we learn more about type:null other than "it's a synthetic pokemon" throughtout the game.