What's the point of having different abilities that are functionally exactly the same?

>Here's Reshiram's Turboblaze and Zekrom's Teravolt
>it's literally just Moldbreaker
>Full Metal Body is Solgaleo's unique ability, never before seen!
>it's just Clear Body, which is also White Smoke
>also Shadowshield is Lunala's, totally never seen before guiz!
>it's Multiscale

Just give Solgaleo Clear Body and Lunala Multiscale if you're just going to do that shit. Or you know, make Full Metal Body and Shadowshield something actually unique.