my first was x. i think that we are lucky that our first pokemon experience was on the 3ds

Emerald here! I really enjoyed ORAS ans Sun/Moon, though, Scarlet and Violet are not my cup of tea.

Mine was Sun!... If we're talking about mainline Pokémon. If all Pokémon games are fair game, spin-offs or otherwise, it would be PMD: Explorers of Darkness.