I said of last couple gens for a reason. It's when the wi-fi distribution trend started. And I am pretty confident that every event Poke released so far in gen 7 and 8 has been (eventually) been available to everyone.
Well, let's check!
2016 Japan Exclusive Events:
Celebrate Alolan Vulpix (pokemon center sapporo)
Celebrate Comfey, Eevee & Pikachu (pokemon center birthday gifts)
It's uh....a good thing you specified Gen 7 because otherwise this list would be much, much longer. I will note the oddity that only
non-japan companies got those ORAS-era Mythic 20th annivesrary events. Bit of a reverse situation than usual, eh?
2017:
Meloetta, Manaphy, Hoopa - Pokemon Scrap distribution. Aw man these were level 15 too...
Rotom - LINE
Shiny Mimikyu - a tie in with Pokemon Center's ghost line
Mimikyu, Ditto (with a Light Ball), Pikachu, Pikachu (Holdhands, Happy Hour) - Pikachu Outbreak
Jirachi - Tanabata
Charizard, Piplup, Lucario - I Choose You 7-11 Distribution. Going to skip ahead a bit here: These 3 were not released with the western release of the movie. If something was tied to a movie and released the following year I'm skipping it.
Lunatone & Solrock - Daisuki club Mystery Files
Mew - Another 7-11 ICY distirbution
Ho-oh - Movie theater
Victini - They rennovated a pokemon center
Lillie's Vulpix, Kiawe's Turtonator, Mallow's Steenee - Pokemon Festival
Vaporeon, Jolteon, Flareon, Espeon, Umbreon, Leafeon, Glaceon, Sylveon - Pokemon Center tie in with an Eevee line
Binding Band Bewear - Pokemon Center Spring Festival
Goomy, Mareanie, Oranguru, Passimian, Turtonator, Drampa - Pokemon Center easter eggs
Sweet Heart Pikachu - A donation gift (this one recurs so i'll ignore it moving forward)
Machamp - Saori's Machamp
For what it's worth, America got Exeggutor (World Championship) & Arcanine (another battle competition), America & Europe both got Salazzle & Lycanroc (TCG tie ins). For...*glances at the above list* all that's worth....
2018:
Let's go Celebrate Chansey
Jirachi - Tanabata (I am pretty sure a tanabata jirachi has been released every single year in japan....was this the entire reason it got into swsh...?)
Golduck -Ryota's Golduck (for the japanese regionals)
Pikachu, Snorlax - Pokemon Cafe opening
Mienshao, Cofagrigus, Honchkrow, Mightyena, Crobat, Nidoking - Pokemon villains give away
Arceus - CoroCoro giveaway
Corsola - NicoNico give away
Shiny Groudon, Shiny Kyogre - Pokemon Center distribution
Some but not all the legends were given away in America & Europe again.
2019:
G-Max Snorlax - Pokemon Festa
SWSH Pikachu, Eevee - Pokemon Center birthday gifts
USUM Shiny Necrozma, Let's Go Shiny Krabby - Secret Member Club
Nidoqueen - Japan Regional Championships
Surprisignly few events over all in 2019, incidentally.
2020
Lucky Egg Chansey - Pokemon Mister Donut
Marshadow, Volcanion, Genesect - Mythical Distribution (interestingly, South Korea got these in 2021)
Milcery (Star Sweet), Milcery (Ribbon Sweet) - Pokemon Center Birthdays
G-Max Lapras, G-Max Coalossal - World Hobby Fair
Most of the distributions here were wi-fi events and I kind of wonder if the pandemic forced their hand here.
South Korea, specifically, got a shiny amoonguss because of the Championships
2021
Japan championships got a Torkoal
in exchange, america & europe got a shiny toxtricity for the TCG
In conclusion events are a land of contrast.
At the very least I expect japan to get the shiny wolves, though. They made art for them and everything...