>>40452950>Mew and DeoxysYou can glitzer pop in Emerald (
https://bulbapedia.bulbagarden.net/wiki/Glitzer_Popping) to unlock their events and soft reset for them. I think you need a non-English European copy for that though.
If you have 2 GBAs (or a GBA and GameCube with the GBA Player), 2 wireless adapters and a flashcart you can download the distribution carts and send them to your game.
>JirachiThere was a JP event for it in 2014/15.
The Jirachi from the Colosseum bonus disc can be shiny (
https://www.reddit.com/r/pokemonrng/comments/3czdlx/a_guide_to_rnging_wishmaker_jirachi_shiny_or_ivs/) and the one from Channel can be too, but I think the RNG for that is almost impossible without using Dolphin.
>ManaphyI think the only way to get this shiny is to get the egg from Ranger, so good luck with that.
>Darkrai, Shaymin and ArceusUse the DNS exploit in
>>40453172 to get their event items.
>GenesectJP only event. If you have a DS flashcart or CFW 3DS then just put a Japanese B2 or W2 rom on it and grab it off Mystery Gift.
Diancie is another one that's a JP only event that you can't get without trading or just injecting the wonder card.