Between the omnipresence of hazards and the boosts it's guaranteed to get, I'd say it's more akin to XY Bisharp, specifically during the DeoSharp era. Off the top of my head a lot of those fighting types are closer to checks, because 5 boosts Gambit can Sucker most of them if they've been decently weakened or crippled (not even accounting for SD boosts). Same goes for revenge killing, esp Moth and Greninja which are frail. Moltres does hold up against it pretty well though, but it's become less viable than it used to be fwiw. Either way a gambit test should wait until DLC2, and it would be worth freeing with Volc/Eleki/maybe Espathra if a tera ban happens.Let's not pretend like Kingambit is broken without Tera
Without it, we got counters like:
, ID , ID , , , , ,
The following check it extremely well, or at least revenge kill it, which is all you need if it's the final mon anyway
, , , , Willo , Heat Wave , literally any fighting type
Like come on, sure it's still a great mon, but it's essentially just a better ORAS Bisharp, within the context of the meta surrounding it.