>>56747358i just posted the global plat rate for your other plats kek
concerning the auction, i'll admit i don't exactly know what i'm looking at here but it looks to be the same as what RG posted above, where it rolls a number between 0 and 65535 and tries to be below 16 to determine shininess for tier_X pokemon (legendaries)
i don't know how shinies and plats are handled separately here, it might actually be that plat legends are actually a little less uncommon than shiny legends in the auction, if plats were their usual .06% chance compared to the .02% here, which would be fucking funny