[sd79812]

Why do cations with greater oxidation number form stronger metallic bonds with itself?

Yes, you're increasing number of delocalized electrons when you have metallic bonds in a higher oxidation number material, but AFAIK the delocalized electrons also have to make up for more protons repulsing, and protons have the same charge as electrons, so shouldn't the added gluing effect of more valence electrons just cancel out because you'd have to counter the protons repulsing so valence electrons have absolutely no effect on metallic bonding and metals all have the same bonding force with themselves respectively?

[Hunter2]

and protons have the same charge as electrons

This is wrong the charges are in opposit. Protons are positiv and electrons are negativ.
In a metal the oxidation number is Zero.

What do you mean with

Why do cations with greater oxidation number form stronger metallic bonds with itself?

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In compounds of metal and nonmetals we have ionic bonds, where also a oxidationnumber is existing. But normally no metalic bonds.

[Borek]

Why do cations with greater oxidation number form stronger metallic bonds with itself?

Do they? Metallic bonds exist in metals between neutral atoms, no cations/oxidized atoms there.