Generation 1: Dragonite. Lance has 3 of these things later on, and they fu**ing work!
Generation 2: Milktank, my only grip is her extreme bulk that early in the game.
Generation 3: Milotic... Don't ask why.
Generation 4: Garchomp, boy was he broken for the longest time!
Generation 5: Therian Forme Tornadus, competative matches against this thing were a pain. Good thing we now have checks!
3DS FC: 3652-1012-6122
"Diancie is a good Pokemon because it can take a Water Pulse from Siebold's Clawitzer, so everyone stop whining about it." Some casual player on Miiverse 2014.