Over the generations, we get new mechanics to enhance the games. Gen 2 gave us shiny forms, breeding, night and day, weather, and the dark and steel types. Gen 3 gave us double battles, abilities, and berries. Gen 4 gave us the physical-special split and the poke radar. Gen 5 gave us triple battles, rotation battles, hidden abilities, the oval and shiny charms, and reusable TMs. Gen 6 gave us mega evolutions and the fairy type. And finally, Gen 7 gave us alolan forms, Z moves, and ride Pokémon to replace HMs. So of these (and others I may not have listed), which do you think has made the biggest impact on the series? I think shiny forms, abilities and hidden abilities, and mega evolutions are the most impactful on the games. -Shiny forms quickly became fun and exciting to find, even with such low chances. Some people are constantly on the hunt for those little sparkly stars. -Abilities and hidden abilities all have a unique way of supporting the Pokémon. While some are more useful than others, it is an indispensable mechanic. -And lastly, mega evolutions gave some old and less used Pokémon a breath of fresh air. For example, Kangaskhan was almost completely useless until it got its mega, which is utterly broken. Nonetheless, it gave people a chance to see Kangaskhan, and other Pokémon, in a different light.