Ditto. The one Pokemon with more uses than Mew and Smeargle combined. With Impostor now available for the blob, one can use it for anything other than just breeding. Great revenge-killer (send in after something's been killed, least you get hit with a now Super Effective Outrage because you switched into Garchomp), entry hazard setter if you can't otherwise fit one on your team (switch into a Skarmory and use Spikes before it can Whirlwind you away), and I'm probably the first person to suggest use Ditto as a wall-counter (most run Toxic; if it has Natural Cure like Blissy it'll force it out at worst while Pokemon without Natural Cure, like Jellicent, will be ruined).
Don't use a Choice Scarf, contrary to what most posts I've seen suggest. Yes you get a 1.5 boost to Speed, but you're then locked into only one move. Not bad on something like the aforementioned Garchomp but the real question is why use that when you can use Quick Powder instead? It doubles Ditto's Speed (a bigger boost than Choice Scarf) and you can switch between moves at will. For example, you switched into a Garchomp equipped with a Choice Scarf. Impostor activates, turning you into Garchomp. Looking through it's attacks you see Dragon Claw, Fire Fang, and who cares about the others for this example. Now, you select Dragon Claw expecting a Super Effective hit, but your opponent outsmarts you by switching to a Ferrothorn who resists & survives your hit. Equipped with a Choice Scarf, all you can do is switch leaving Ferrothorn a free turn to Spike/Stealth Rock your side of the field: but with Quick Powder, you can use Fire Fang before Ferry can do anything, and now that it's been KO'd, you now have a powerful Pokemon on your side of the field with far more Speed than anything your opponent has. At this point, either they'll try to go down fighting or rage quit just to deny you a win.
For next week's pick, I vote Arcanine.
† I am a Christian and proud of it! Copy and paste this if you are too.†
-Take up thy cross and follow Christ Jesus.
~Don't underestimate my God~
♥I believe in Jesus Christ as my Savior. If you do too and aren't scared to admit it, then copy and paste this in your signature.♥
I don't calculate stat values, I don't use cheating devices, I don't breed my way to perfection, and I don't care about natures. I catch my Pokemon the way they are, and treat them like individuals instead of brainless drones. If you use this philosophy, copy & paste this into your signature. (Started by Tyranitar, "I don't use "uber" Pokemon," edited out by me because I do use "uber" Pokemon on occasion.)