So there really is a second King around. The question is if they're talking about Shirahoshi's future consort (their other sovereign) or another King entirely.
If it's the latter then it could be Uranus, as Pluton is already confirmed to be a battleship.
Now if we take this one step further and assume that all big endgame players will have access to an ancient weapon, then Luffy is obviously backed by Shirahoshi, Blackbeard could unearth Pluton and the Government might be already in "possession" of the other King, Uranus (Imu?).
Seems fitting, considering how Uranus means sky or heaven, and Imu already resides in Maries Jois among the clouds. Now adding the fact that the Seakings anticipate the use of Noah (to relocate the Merfolk to the surface?) a meeting between Poseidon and Uranus makes sense.
As for the translation, could any native speaker elaborate what exactly "I wish I had game" means? I can guess because of the context, but it doesn't even show up in google (the search is corrupted by the "game" tag, you only get streamers and other garbage as a result) and urban dictionary is blank too.