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I went to the 10 year celebration of Pokemon event and got a Celebi in my LeafGreen version with my brother and our kid neighbor friend
Kid neighbor friend, for whatever reason, wanted to start a new game that same day and he overwrote his save file not knowing you only get one and he deleted his Celebi.
He cried a lot and my brother gave him his hacked Deoxys to make him feel better.
We still give him shit for that to this day. Fun memories.