Why no Shadow Shark?

So this is something I’ve noticed in past cups when creating teams. But why does PvPoke not have any ranking on Shadow Sharpedo?

It has one for regular Sharpedo, but nothing at all for Shadow Sharpedo. And when I try to add one in team builder, it says “A Pokemon may have too low stats or be ineligible.”

Now I know for a fact that Shadow variants of this Pokemon have been released in GO cuz Team Rocket Admin Sierra had Shadow Carvanha you could catch. I was fortunate enough to catch one that ranked #1 in Great League according to Poke Genie.

Are Shadow Sharpedo’s stats so low that it’s not even worth using? Cuz I used my Rank 1 Sharpedo in the Great League years ago. The easiest way to sum up how it plays is that it is an absolute glass cannon. It’s super frail but hits incredibly hard with its fast move alone. A Shadow Pokémon I’ve run that performs similarly is Victreebel, and it has a ranking on PvPoke.

I’m of course not considering using my Rank 1 for Great League or Great League remix (maybe in a future cup where the format greatly benefits it). I’m just genuinely curious why this particular Pokemon doesn’t have a ranking on PvPoke.