Ditto @ Choice Scarf
Ability: Imposter
EVs: 248 HP / 252 Def / 8 SpD
Relaxed Nature
- Transform
I rarely see Ditto. It's rated C in the viability rankings thread. It's usable in even PU. It sparsely shows up on teams and does exactly one job and everyone is familiar with what that one job is. Maybe this isn't listed yet because of that - people know what Ditto does. It turns into your opponent's Pokemon and generally revenge kills them. Ditto has a deeper impact than that though. Its presence can change the flow of the game.
You don't even have to use it for it to have an impact on the game; however, that impact is heightened versus opponents carrying boosters. It's more than just a revenge killer. Here are just a couple of examples in which Ditto's presence is useful:
Mega Charizard X: Ditto's presence will scare many Mega Charizards from boosting so it doesn't come in and copy a boosted Mega Pokemon. This makes it much more reasonable to wall without relying on phazing or having a truly proper counter.
Mega Diancie: There are two types of boosting Mega Diancie and Ditto scares both. The Calm Mind variant is a little less worried but is, all in all, still threatened by Ditto's presence.
Belly Drum Azumarill: Most Azumarill users would think twice about getting greedy with a Belly Drum as long as Ditto is alive and healthy. This makes Belly Drum Azumarill essentially an Azumarill with 3 moves and a Sitrus Berry.
Baton Passing: Baton Passers in general are going to fear Ditto's presence because it inhibits that aspect of their team entirely. Baton Passing effectively requires a couple of turns to set up properly and Ditto just borrows those boosts with no time investment whatsoever. One just has to be careful of Substitute in this case. It's worth noting that Substitute is a pretty big stop to Ditto in general. Substitutes will, in effect, minimize that entire mental impact on the game that Ditto has.
What kind of Pokemon work well with Ditto? I follow one rule.
If it dismantles defense it supports Ditto. This includes our wallbreakers, stallbreakers, and trappers. I especially like our 3 most common trapping Pokemon as support options as partners: Magnezone, Gothitelle, and Dugtrio. Those 3 excel in taking down common defensive Pokemon like Ferrothorn, Heatran, and Skarmory. Dismantling an opponents defense will raise Ditto's risk factor for their team.
What kind of team can Ditto fit on?
It best fits on balance and stall best in my opinion. Hyper Offense is generally more about maintaining momentum and continually dealing damage. This in itself is keeping the opponent at bay and often dissuades them from bringing in some kind of sweeper which is what Ditto would ideally want to come in on. This doesn't mean you can't use Ditto on Hyper Offense, I just feel that it doesn't contribute quite as meaningfully on a team like that. Balance uses it well enough. Oftentimes when an opponent brings in an offensive powerhouse that scares your currently active Pokemon you will switch to a member of your team that resists the attack (much of the time this will be a member of some kind of defensive core.) The act of switching in that case, and being unprepared for a boosting threat, will allow the opponent to claim free boosts. Ditto often dissuades this.
Why would anyone in the right mind run a Ditto (generally considered a revenge killer) on stall? There are cases in which a stall team fails to deal with a boosting threat and it manages to remove an important member of your team. The nature of stall is one of slowly whittling down opponents while using smart plays to minimize your team's damage taken.
Ditto is a safety net and a failsafe in this case. The booster is dissuaded from boosting for fear that Ditto will capitalize on the increased stats and punch holes in their team.
Ditto does have a couple of disadvantages. If played poorly it will absolutely be dead weight. Balanced teams that do not boost and have rigid defensive cores will make Ditto have difficulty shifting the flow of the game. It is also often dead weight versus pure stall teams.
The more defensive your opponent's playstyle the less impact Ditto will have on the game.
Ultimately, Ditto at its most basic is a revenge killer. On another level it can dictate the flow of the game, especially if you're worried about boosting threats. Ditto dissuades. Ditto dispatches. Ditto decides.