Mew
Ok I was in Mystery Jungle and at the end of the dungeon, you battle Mew...so I battled Mew and I got the Grass Cornet(One of the seven treasures) After I collected it Mew reappeared and it grew some kind of kinship with me and is on my team now..Before battling Mew you might wanna save in case Mew doesn't befriend you..anyway hope that helped..
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