I am EV training my goodra, and wanted to put 44 EVs into its speed. So I gave it a power anklet, and beat six zubats, to give a total of 54 EVs, then fed it a tamato berry to reduce 10. But even then it had more than a 100 EVs.
I am sure it doesn't have pokerus, so what is the issue?
Pretty sure you were SOS chaining. If you beat 6 Zubats in a SOS battle, then it is right. Defeating Pokemon in SOS battle gives more EVs than normal.