references:
http://www.smogon.com/forums/showthread.php?t=48338 ( abit outdated, but help understand the concept)
Name: Type Twist
Description: A Pokémon that is able to put to use one or more underused physical or special based type thanks to STAB, stat distribution, movepool etc.
Justification: There are a lot of attack types which have the potential to be very damaging to the metagame, but that, due to bad moves or a bad distribution of the good moves, are underused (not tier-wise). This Pokémon should be able use on or more of them, shaking the metagame around itself a bit. Maybe walls that previously didn't fear an uncommon type will now start to be more on guard, and other answers will rise to fight the new threat. So, I'd say that:
- Has a positive effect on the metagame. The increase of type variety definitely promotes a more diverse offense which will possibly lead to a change in the otherwise quite stagnant Stall game-style.
- Allow us to learn more about the metagame. All of these underused types have some potential yet flawed abuser. Maybe, if the playtest show the power of a specific type in conjunction with a more traditional offense, people will try the already existing Pokémon (maybe with hazard, field or Baton Pass support to overcome the flaws)
- Introduces a new niche in the metagame. This goes without saying. These types lack (by definition) a combination of good user and good movepool, so creating one will necessarily shape a new niche, with all the consequences outlined above.
Questions to be answered
1) Which are the most potientially damaging but underused types in OU, and how CAP9 takes advantage of one or more of them?
2) How much standard walls relied on the absence of this/these type/types? How the introduction of CAP9 affect the viability of walls and checks in general?
3) How the metagame changes around to combat the new threat? Different EV distribution? Or different Pokémon altogether?
4) How are the other sweepers influenced by CAP9? Does the introduction of the new threat overshadow previously common attacking types? Or there are attacking types which, thanks to sinergy, thrive even better in the new environment?
Explanation: Physical Fire, Physical Ice, Special Flying, Physical Electric, Special Fighting, Special Dark... the list goes on. All of these types share a common trait: they are underused but potentially very dangerous. Just look at the thread I linked above and you'll see what I mean. The reason why these types are generally unviable are multiple. Some have very few possible candidates (like Infernape for physical Fire, or Lucario and to a lesser extent Infernape for special Fighting), others suffer from low BP moves (like special Flying and physical Electric), and there are ones who lack dedicated abusers in OU (Special Dark for example).
All these moves have the potential to affect the metagame greatly, because walls intended to wall that certain type are prepared to wall just a part of the physical/special spectrum. Special Ice or Fire, Physical Flying etc. Just think of how much a powerful Aura Sphere (maybe Nasty Plotted) would put the hurt in Blissey (leaving the opponent who relied on Blissey alone for sp. atks in fear), or how a boosted Volt Tackle would hurt Skarmory and Gyarados (two very common physical walls on stall).
I think there is enough choice type-wise and stat-wise to not make this concept restrictive (at least, far less than others). And to those who may think this concept is a bit directionless at the start (at least in the type choice threads), they are wrong. The discussion should not be about the favourite type of someone, but instead about which type has the potential to be more dangerous (valuing common threats, SR factor, available movepool etc). All in all, I think that, even when it comes to choose the type, there are enough point for a non-clueless discussion.