Having my favorite Pokémon be acknowledged feels great. I was really excited when Sceptile was confirmed for Pokken Tournament. Considering he was one of only 14 Pokémon species to be playable in the game, it felt really special.
The moment you find the shiny pokemon you have been looking for! I have been searching for a shiny Zorua for a while, and after searching for months, I finally found one! And the moment you soft reset for a shiny legendary and it only takes 50 times before it shows! Same day as I caught the Zorua, I caught a shiny Giratina!
Also, when a Pokemon that is a bat or a lizard is revealed~ You can imagine I was jumping around when Helioptile, Heliolisk, Noivern and Noibat were revealed in X and Y~
So whilst I was rewatching the SuMo announcement trailer, I noticed that Whitney's Miltank and Cynthia's Garchomp were present. I got a dorky smile, because they put two of the most infamous Pokemon in the 20th Anniversary Trailer :v
Honestly, one of the things I love best in recent games is the Pokemon Amie. It's just a little, gimmicky detail, but I love that it adds that layer of depth where you can interact with your Pokemon in a more playful way, even changing how it relates to you in in-game battles. Such a small thing, and it makes them seem so much more real.
Catching a Mesprit in Omega Ruby with four perfect IVs on the first try, something that's only made better by the four perfect IVs being the right ones as well (attack, defence, special attack and special defence).