InsaneStar7
Technophile Trainer
And before you say legendaries never lost their signature moves, Darkrai stole Dialga/Palkia's at that event. And Victini stole Zekrom/Reshiram's at that other event.
Yes, but that doesn't count as stealing because they can't get it by level up/move tutor/breeding. When other standard Pokémon by the next version or a new generation comes up and updates/creates the move list of other Pokémon by getting other sig. moves like the Dweeble family can get Rhyperior's Rock Wrecker by leveling up, that would count as stealing the signature move.
I think Beedrill sould get either the orders (attack, defend, heal)
Vespiquen will be really furious if her signature moves are shared/stolen to another species.
Ok, Moving on the topic.
Machamp - Mach Punch (The Pokédex says it can fire punches at blind speed)
Sawk - Cross Chop (It should be able to learn it since it's a Karate Pokémon and I was surprised that Sawk couldn't learn it. Cross Chop is somewhat a Karate based attack move)
I think I that's it I could think of.