Cae L Tha

I had just gotten my Pkmn pearl version back from my freind, And Was looking forward to playing it the next day.
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I decided one day to play my pokemon pearl, so I did as I said and played it, oddly my guys name was changed from "Jacob" to "Cae L Tha". This I found very awkward, I search this item and could not find any information on what these letters meant. So I decided to click on the account anyways, ignoring the change of name and went ahead on playing, but as soon as I had clicked the account, The screen turned black as to load the page, but stayed like this for severalminutes, after several minutes a figure popped up, it was a green creature with a fin as the lower body, "Is this Cae L tha?" it asked me and gave me a Y/N answer choice, I said yes because of the odd name change, "Welcome back my freind" the odd figure said and dissapeared, next the screen weant grey, then slowly faded into what looked like a storage area, oddly instead of being the boy I was, I had become what looked like a professor as my sprite. "The Game Must Be Hacked." I said, so I asked my freind about it, he said he was using his action replay, and the game glitched up and froze, and he didnt play it since then. Anyways, As the professor guy, I walked into the next room through the only available door, In there I found what looked like the same odd figure I encountered at the start 'Cae L Tha' He said to me, and I had been approached with a Y/N question again, this time I didnt know what he meant by that, so I said no. The screen went into battle mode, soon I noticed I was up against a lvl 70 giratina, but what creeped me out was that the giratina's chest was open and you could the blood oozing out and the ribcage, at this point I lost it and threw up in my nearby trash dispenser. Because of the horrid scene, I turned my game off, and went to bed.
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The next morning I do my regular morning routine, get out of bed, brush my hair and teeth, and ate breakfast. I then went back into my room and inserted Pkmn pearl and turned it on. I though last night was a dream until I noticed my accnt name as 'Cae L that'. I decided to give the game a go, when i clicked on it, it automatically took me to the battle scene with the bloody giratina, I threw out my level 76 empoleon and fought him, My empoleon soon was demolished by the giratina. I looked in my inventory for a potion but what I found was a "ak47" I kinda laughed because of the stupidy of what I had found so I used it. My empoleon was returned to his pokeball, now my avatar, was standing on the battlefield with an ak47, next the words in battle said "Professor Shoots Giratina" I was wide eyed as the professor pumped several bullets into the giratinas head, and chest area. Next the giratina fell over on his side, and the words 'Giratina had been killed' appeared. we left the battle and the odd figure said 'Cae L tha' and the screen turned black.
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Ever since this odd happening has occured, the pokemon pearl game would not work on my DS, or any elses.