Some types are just undervalued or underused, despite being useable on paper. Some may be good for a certain role, but have no pokemon with the right stats or movepool to use it.
This allows us to see if certain types can do certain roles which they type does not already have a decent pokemon to do so, within the 5th Generation Metagame. In a way, this is similar to Stratagem in the 4th Gen CAP.
Questions To Be Answered:
- Can X type perform X role within OU?
- How would the advent of a new offensive/defensive/supportive threat of a different type to the existing ones effect OU?
- Are some types underestimated, just because the pokemon who weild them suffer in other respects?
It's often thrown about, things such as Poision is a Bad attacking type! Or Fire is a bad Defensive type!
However, if you take these two aformentioned examples, and look closer, you can see that there is nothing to justify this. Poision types have no pokemon suitable to sweep in OU, the closest they get is Crobat, who has no-set up moves, and is somewhat frail. Nidoking is close too with Encourage, but he's slow.
However, if you look at OU right now, Poision actually has great neutral coverage. The most prominent types are Dragon, Water, Psychic, Fighting, and Steel. There's also quite a lot of Grass, Rock, and Ground-types. Considering Poision has some good STABS [Slime Wave is Base 100, 100 Accuracy, and can Poision], it could be interesting to see what would happen if we actually made a Poision-type sweeper.
Taking the Fire type example, the closest the Fires have to a defensive build is Torkoal, who lacks Sp.Def and HP, and Magcargo, who has one of the worst duel-types possible. Heatran is bulky, but is more oriented towards being a bulky sweeper, not a defensive pokemon outright. Fire has been shown to be a useful type for bulky attackers, such as Heatran, and Moltres in UU [As well as Entei in NU], so, is it possible to have a defensive fire-type, which is viable in OU?
Rock is another type which is often overlooked in defensive roles. Tyranitar only works defensivly due to monsterous stats in the first place, and Craydily benifits from it's Grass-type, as well as Recover, and Stockpile, and Suction Cups, and even then, it's only average at best.
How about a supportive Dragon? Or a Defensive Fighting-type? A flying-type sweeper, who dosen't focus extensivly on their alternate STAB [Looking at you, Thunderous]. There are many different possibilities which remain unexplored, due to there not being a pokemon with the right stats and movepool to give the type a legitamate chance at being viable.