Gym Bros
Each region classically features 8 gyms, but because of the mechanics of the first gym in this region, there are actually 10 gym leaders in this region
Unova (Striaton City Gym)
This starter trio represents different types of entertainers
Gen 7: Decidueye, Incineroar, and Primarina
This is the fastest Pokemon in the game (highest base speed stat - 200)
Regieleki
Ice and Fairy
Alolan Ninetales
This Pokemon was said to almost have been hunted to extinction in Red/Blue due to its gentle nature and use as transport, but later, in Sun and Moon, the Pokédex noted that, thanks to protections, their numbers have recovered significantly.
Lapras
This is the only type to not receive a gym in it's debut generation
Dark
The final stage evolutions represent different types of events and festivals
Gen 9: Meowscarada, Skeledirge, Quaquaval
This generation introduced the most new Pokémon in a single generation, with 156 new species added
Gen V / Black and White / Unova
Dragon and Fairy
Mega Altaria
This is the most common type of gym
Water
These final evolution starters represent nobility in different cultures (a Chinese general, a French noble, and a Japanese samurai)
Gen 5: Serperior, Emboar, and Samurott
This is the only non-legendary Pokemon that starts with a Base Friendship of zero
Buneary
Fire and Water
Volcanion
In Generation I, this Gym Leader’s Pokémon knew only Normal-type moves despite not it being a Normal-type gym.
Brock / Pewter City
The final stage evolutions represent a fantasy theme: a mage, a knight, and a rougue
Gen 6: Delphox, Chesnaught, Greninja
Which Pokemon evolves into its final form at a level higher than any other Pokemon (level 64)
Zweilous
Fire and Steel
Heatran or Mega Heatran
DOUBLE JEOPARDY
This is the only region to NOT feature EITHER an electric type gym or a water type gym
The final stage evolutions in this gen represent figures in mythology (across different cultures)
Gen 4: Infernape, Torterra, Empoleon
The World Turtle, or Cosmic Turtle, is a widespread mythological motif where a giant tortoise or turtle supports the world on its back.
Infernape is primarily based on Sun Wukong, the Monkey King from the classic Chinese novel Journey to the West.
Empoleon is based off of Poseidon from Greek mythology.
The only Pokemon that learns zero Normal-type moves
Weedle
Electric and Grass
Hisuian Voltorb, Hisuian Electrode, Rotom (Mow Rotom)