8 Player smash is the best. There are times where i don't know where i am though lol.
My friends and i did 8 player Robin and Charizards. lots of thorons
I've found a shiny magnemite and pidgey in FireRed years ago. though the Shiny pidgey was before i had pokeballs :(((
Shiny Rattata in White 2, but the rival killed it.
In XY Shiny Froakie and Fenneken though masuda method.
And finally in ORAS Shiny Reshiram