I couldn't just stop XD, not when there was a LITERAL RETIREMENT VILLAGE on the horizon!
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Shadow Pokémon have undergone a process that basically turns them into soulless killing machines that are unable to feel emotions and makes them willing to do things that it normally wouldn't do like directly attack an enemy trainer. It also prevents them from earning experience points. This is why purifying them is important.
Also, it was said in a previous video that Shadow moves are super effective on everything. That's part of the reason why crooks use them.