Many may know the incident when I traded my legit Rayquaza for a hacked Pokemon without knowing, then tried to get it back... But now, I knew I still had the rayquaza ever since. I played with it non-stop ever since the trade happened. Rayquaza reached level 100. But then I stopped playing for months, because X came out. I came back to find Rayquaza is missing. I checked the day care and did pokesearch in the boxes, but never found it! I also found my shiny mew, celebi, and mewtwo are missing! So basically, my question is how did these Pokemon go missing? Was there a memory issue? Corrupted data?
Edit: I stopped using Dream World Before B2 and W 2 came out, so it couldn't be that