There is not until the next event for these Pokemon comes along, and I can assume that that won't happen for the Mewtwo and Zekrom/Reshiram events, at least for those specific event moves.
However, you can always trade for these Pokemon. Plenty of people on this site have the Darkrai and Mewtwo events. Although you might have to offer up something good for these Pokemon. But just go on the chat and ask. Eventually you'll run into someone with these Pokemon.