When you find Mewtwo in the "wild" he knows the moves- Recover, Swift, Barrier, and Psychic. So, it's probably PSYCHIC. Great answer but he does go on to learn psyshock and psystrike i think. 2 extremely powerful moves. my mewtwo is legit lv.100 and he knows both. not 100% certain there both learnable as 1 could possibly be a tm but i really cant remember that :)
Chat with our AI personalities
Psystrike
Giratina's signature move is Shadow Force.
Only Giratina can learn shadow force. The only thing that proves or said that Giratina can learn the move is because it is it's signature move.....
Splash is a move that is completely useless (with the exception of it in Pokemon Mystery Dungeon, where it deals 5 damage to the opponent and the Pokemon that used it), and is Magikarp's signature move.
hi signature move- Shadow force. (Which he already has) But another good one is earth power :) Hope I helped