Well I have a Raichu that I'm using on PS and I keep trying to give it Iron Tail, Extreme Speed and Volt Tackle and it's not working. Its just keeps saying that the set is incompatible. Why is this?
That's because Raichu only gets Iron Tail and Extreme Speed from 2 seperate events, and those moves arent egg moves like Volt Tackle, so you cant have them on the same Raichu.
Source- Pokemon Showdown's /learn command.