Me, Myself and I
Ash's only travelling partner that lasted more than 10 episodes (prior to Pokemon Journeys) who didn't have a parallel character from the games
Who is Max (May's little brother)
This is the only typing that doesn't have a gym to represent it prior to Generation 8
What is Dark type
These Pokemon are the only 3 evolution lines that can be caught in every regional pokedex throughout the first 7 generations
What is the Zubat line, Psyduck line, and Magnemite line
Articuno, Zapdos and Moltres are the most encounterable legendaries in this many games
What is 15 (Red, Blue, Yellow, Silver, Gold, Crystal, FireRed, LeafGreen, Platinum, X, Y, UltraSun, UltraMoon, Sword, Shield)