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Just beat E4 and decide to try the Friend Safari with a few anons I had added from giveaways. I'm in the second safari and I say to myself, "Hm, wasn't there a rumor that it's more likely to encounter shinies in the safari?" The next encounter is a glorious gold Riolu. It also has Prankster.
Next safari I'm in, the third encounter is a shiny Espurr.
I think the rate has gone up.