Spookzilla has the highest base Attack stat of all Ghost-type Pokémon.
Spookzilla, along with Scytill has the highest base stat total of all Ghost-type Pokémon. It also has the highest base stat total of all non-legendary Ghost-type Pokémon.
Despite having three heads, it could not learn Tri Attack prior to the current update.
Spookzilla's cry could be a shortened version of Xenoqueen's cry from Pokemon Uranium, but this is unlikely.
Spookzilla is a dinosaur/Godzilla-like creature with three skeleton heads. Its Pokédex entry hints that it is based on the "Spooky Scary Skeletons" song. Description is based on the lyrics: "Send shivers down your spine, Shrieking skulls will shock your soul, Seal your doom tonight"