Aragorn the King
Literally a duck
Slowbro is the Charizard-X counter. You switch in on a DD, paralyze it, Slack Off, Scald it, etc. You've completely removed what makes it threatening, and will allow you to never get swept by it. Check out the project or Charizard's analysis to see why it works. Also, the set used that week was the bulky set, so a +1 Dragon Claw does less.Slowbro shouldn't be mentioned as a counter to Charizard X, a +1 Adamant Dragon Claw is a 2HKO, and not considering lesser used options such as Outrage and Thunder Punch.
Also if you are going to list all roles you might as well mention Trappers (Magnezone, Gothitelle, Wobbufett) and.VoltTurners (Rotom-W, Mega Manentric, Mega Scizor, Landrous-T,etc.)
Edit: Seems you like the volt turn thingy covered after all, but there a LOT of non OU pokemon on these lists, once you go through the edits mods have suggested we'll help you clean up.