Well it was quite an interesting story.
Back in the day when I didn't really know much about shinies and such, I encountered a Shiny Numel. Now, my cousin (Who's a very "hardcore" Pokemon player) was with me at the time. I told him "Woah, a water type Numel, IT'S GONNA DIE) . My cousin was all "Dude what the heck are you talking about? " . He took my game and stared at it for about a minute and told me too catch it. Once I caught it he offered me a Groudon. Now, at that time to me, Legendaries were just A+ material to me, and having a second Groudon just made my jaw drop. Now too this day, even though he cloned it many times over with this Action Replay (During 4th Gen) , he refuses to give me a Numel (Which is now a Camerupt) .