Ehh, not sure if I should report this since there is no proof, and I find it very perplexing, but:
I was battling
Waluigi3351 and some bizarre things happened. First off, his Porygon-Z was faster than my max-speed Aerodactyl, so I naturally assumed it was Scarfed. But then it freely switched attacks. I didn't care too much since this didn't affect the battle too badly...but then his Electivire outsped my max-speed Latias. It had not gotten a Motor Drive boost, and my Latias had not been slowed in any way. A Scarfed 'Vire? I was willing to accept this, but then it was revealed to have a Liechi berry.
I am reluctant to report this simply because I don't quite get how that would even be possible, even through hacking, and am trying to think of some obvious factor I missed that would explain it. I tried asking him, but he went offline after I did.