Genesect!

Genesect is an event pokemon and can use the move Techno Buster. It changes type depending on the drive that it is holding. You can get the drives on Route 18.

Keldeo!

Keldeo is an event pokemon, so you have to wait for the event. You probably know that it can learn the move Sacred Sword, but it can also learn the move Secret Sword. Once it learns that move, it becomes  a strong ally. To learn Secret Sword, go to the Moor of Iccirus with Keldeo first in your party and Terrikion, Virizion, and Cobalion in your party. There is a man and he lets out those four pokemon. Then, they teach Keldeo Secret Sword. The move looks cool in battle.

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