The definition of a Polar gym leader is when in the randomizer, it randomizes a certain type that is either effective or not very effective against their original typing.
“Lt. Surge is the leader of Vermilion City gym in Gen 1 (Pokemon Red), Gen 2 (Pokemon Crystal...Lt. Surge
“Erika is the fourth gym leader of Red, Randomized FireRed, and Anniversary Red. She is the 12th...Erika