Why female Unfezant surpasses male Unfezant's abilities?

Question

It says in the pokedex entry:

Males swing their head plumage to threaten opponents. The females’ flying abilities surpass those of the males.

Is there any reason given for that?

Answer 1

As far as the Pokemon's performance in battle, they're exactly the same, but the male Unfezant has the head plumage, where as the female doesn't. Without the head plumage, the female Unfezant would be less encumbered, while the male would have to deal with the air friction slowing him down. Much like a peacock, they have striking plumage but can't fly, because their feathers are simply to big and not meant for flying.

Answer 2

male unfezent's heads are different and it has a little weight but it flies and female unfezent's body is a little lighter and its tail keep it balanced and its heads is a little smaller than male unfezent and it eyes are very good at spoting things and that's how female unfezent surpasses male unfezent with it's ablity