Notridley has the highest base Speed stat of all Dragon-type Pokémon.
Also this Pokemon is not Ridley.
The shiny form is not based on Meta Ridley as he is not Ridley.
Notridley's Pokedex entry is not taken from Ridley's trophy description because again, he is not Ridley.
Notridley is not in Smash Ultimate as it has not been confirmed for Notridley, as opposed to Ridley, which has been confirmed. Notridley is too big for Smash anyhow, as opposed to Ridley, who is no longer too big for Smash.
Notridley being able to learn Ice Beam is not a nod to Ridley's weakness to ice because they are not Ridley.
This Pokemon resembles Ridley, a recurring antagonist from the Metroid video game series, but with a mustache, to emphasize the fact that it is not Ridley.
Its name is taken from "Not Ridley", referencing the fact that this Pokemon is, as mentioned before, not Ridley.