Giritina, Palkia, Dialga, and Phione!
How many episodes has Porygon-line been absent from the anime?
(Movies don't count, it hasn't been in any)
All of them, save for whatever (banned) episode Porygon debuted in.
Which Pokemon is capable of dealing the most damage possible in the game, under the right circumstances?
Also, it's three, Trago. Eelektross. Due to Levitate.
I believe it is Shuckle.
What pokemon evolves from a dual type to a single type?
Oh, I meant Ninja. My bad. You two both have Ike avatars, so I derped. ^^;