i think there is a giveaway shiny Porygon 2 who is using spearow as bait. i litterary got 2 Shiny Porygon 2 from exactly the same person.
thus, now i changed my bait to:
Pokemon Wanted: Porygon 2
Pokemon Deposited: Fearow Lv.26 Male
IGN: サト
Message: I want to trade for a pokemon strong in battles.