Can this be a custom starter run on the leaderboards? It is a Mew run in 2:01:30 done on Gambatte-Speedrun.

Route is kinda similar to Nidoking, since Mew can learn all TMs. But Mew doesn't have STAB on Earthquake and a bad early game, so it is definitively worse. Access to Psychic can be useful, though. Sub 2 is easily obtainable, but I am not good with the game in general.