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In Pokémon X & Y, lies a feature called Friend Safari. It uses the Friend Codes of the Friends on player's 3DS, to allow for some variable encounters. The encounters in the Friend Safari will have at least two 31 IVs, and also appears to have a higher chance of being shiny. Additionally, depending on scenario, encountering the Pokémon with Hidden Ability is also possible. A Friend Safari can have up to 3 encounter slots. The first 2 are guaranteed, however the 3rd slot requires the player's friend to have defeated the Elite 4, and also be online the same time as the player. (Note: This flag can be activated using PKHeX) Below is a table of the possible Pokémon found per encounter slot.

This gift was distributed to players who won a lucky draw, and could redeem it when they attended the SpaceWorld 1999. Big thanks to @Afepoke for helping us preserve this rare Mew, as well as his other Japanese Gen I files! Original Thread