I rarely dip into online as I have no knowledge of EVs and such.But I did recently beat someone in my neighbourhood who had kept using a mega Mewtwo Y as his last Pokemon and killing whatever I had left by, using a Shiny Giratina's shadow force to beat him.
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It's IV breeding that things get complicated
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Ev's are kinda complicated at first, but its fairly easy to learn.
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I plan on getting into it eventually, but I'm still trying to get a good shiny that didn't come from an event [spoiler]*Cough Shiny Black 2 Garchomp cough*[/spoiler]