The everlast gel wrap gloves are okay as knuckle guards but fall apart very quick and can be uncomfortable. I've tried the Title Gel wraps, where the first part of the wrap is extra thick - not a glovewrap, but I haven't been able to get a decent wrap with 'em. The super thick wrap probably sounded like a great idea on paper but in practice it's just too bulky.
A lot of guys say "no". for a "knuckle guard" you could always buy a cheap sponge from the grocery store and shape it to fit over your knuckles instead.
i thought fighters only used that for a fight or can you do it for training to. well yeah i can imagine you could thanks boss