For instance you use thunderbolt, what happens if a jolteon comes in, you give it a boost mostly likely and then you have to switch giving them a chance to do whatever they want, maybe set up a agility then what. You just set up your own demise. Thats just an example mind you so dont try to say that "Nobody carries a jolteon" because most of my teams on paper do just for Thunderus-T and other choice users i can set up on.