I shall provide it!
Back in the DS, Gamefreak where actually competent they made this little gem called "Pokemon Black and White", it was an all new Pokemon that featured exactly 0 of the old Pokemon during the main game, once you beat the main story, older Pokemon became accesible throught a new area in the post game.
Fans didn't like that, and they started complaining a lot. The game sold a little bit less than it's predeccesor, but it still did great, and it's sequel "Black and White 2" is considered by many to be one of the best in the franchise.
Buuuuut GF really took the "Where's mah genwun favs!?" criticism to heart.
Enter Gen 6. Pokemon X and Y, in this game your friends give you a new Pokemon to choose, naturally, you think this is your game's starter.
Once you get it you are forced to fight a Pidgey, a Gen 1 Pokemon, then you have to Travel "Santalune Forest" which is a copy paste of Gen 1's Viridian Forest.
After that you are greeted by the profesor that tells you to get a REAL Starter Pokemon, fuck that new shit, here's Bulbasaur, Charmander and Squirtle again! and this time they have the ability to MEGA EVOLVE, the Pokemon equivalent of going Super Saiyan, your actual first Pokemon is immediately outclassed by the Gen 1 Starters.
And Charizard is EXTRA special, as he gets TWO Mega Evolution Forms!
Oh and Mewtwo is in the game hidden in a cave just like in Gen 1!...And he also gets TWO Power ups!
While it was weird, this Gen gave power ups to many Pokemons from other gens, even if a majority ended up being Gen 1 so maybe i'm thinking too hard about it?
So..that was...a bit much but surely Gen 7 won't be as reactionary right?
Well in this game you are a kid from KANTO! Remember from the first game? and you just moved to Poke Hawaii,Alola, and every kid in town lets you know how cool you are for being born in the sacred land of Gen 1. Why?
Because turns out Kanto Pokemon are SUPER SPECIAL in Alola, they immigrated and got cool new powers!! Enter Alola forms! They are esclusive to Gen 1 Pokemon and are a complete new version of your Gen 1 favorites to make them stronger!
Ok so...no other Pokemon got the cool new Power? Only Kanto....aaaaright...Well Maybe Gen 8 will finally do better.
What? There's no gen 8 yet? You're REMAKING Gen 1? FOR THE SECOND TIME?
Well...I guess having Gen 1 to replay with all the new Pokemon in it could be a cool trip, let's see what... I'm sorry what? You can only use Gen 1 Pokemon and their Mega and Alola forms in this game? WHY!? YOU CANT EVEN TRANSFER NEW POKEMON INTO THE GAME!?
Jesus Christ...Fuck I guess you really don't want the dirty new Pokemon mixed with the glorious Gen 1 master race huh?
Alright...Gen 8 is here...Maybe we can try to slow down wit the pand-
HEY GUYS ITS GEN 8 AND IN THE POKEMON VERSION OF LONDON THE MOST POPULAR POKEMON ARE FROM KANTO
AND THE CHAMPION OF LIKE, THE WORLD HAS A CHARIZARD!
PAY NO MIND AT THE FACT THAT YOU CANT EVEN CATCH A CHARMANDER IN THIS GAME, HE WILL GIVE YOU ONE BECAUSE CHARMANDER IS SO COOL.
IN FACT HE'S SO COOL THAT WE SHOULD GIVE HIM A THIRD SUPER POWERED FORM! HERES GIGA CHARIZARD!
That's right, this is GigaMAX, totally not mega evolution! And once again, it's almost exclusively for Gen 1 Pokemon!
Oh and Remember Alolan forms? THEYRE BACK! AND THEY'RE MOSTLY GEN 1 JUST HOW YOU LIKE IT! INTRODUCING GALARIAN FORMS
But thankfully with the new anounced DLC they finally decided to stop giving Gen 1 attention and...
HERES SOME NEW GALARIAN FORMS OF THE LEGENDARY GEN 1 BIRDS
/ rant.
And this was only the tip of the iceberg. So yes, even if they keep adding new designs each gen, they are doing their damnest to not let them shine at all, and have them be immediately outclassed by Gen 1 Redux