To obtain the Supernatural Lowrider, you need to get the Mega Gun. The Mega Gun is acquired (by chance (2%)), after purchasing all 4 Limited Edition items in the store, under Special.. Problem is, Android users do not have the opportunity to get the Mega Gun.
IOS has a random drop of Common, Uncommon, Rare, Elite, and Ultimate all with a different rate drop percentages. The Mega Gun is located in the Ultimate tier (again, only 2% chance).
Android users have only three random drop categories; Common, Uncommon, and Rare. It appears the % drop rate is different between IOS and Droid as well. – So without the Ultimate category, we can never get the Mega Gun, therefore never get the Supernatural Lowrider (LE: October Edition Event).