You sure that is not a crossover where either the roaming trainers challenging gyms for the right to engage in the local pokemon tournament are the Sailor Senshi, or where the gym leaders are?
Because I can see Usagi as a fairy specialist, Ami as a water/ice specialist, Rei as a fire specialist, Makoto as an electric specialist, and I'm not quite sure about Minako. Mythology says she should be a steel type specialist, given that fairy is already taken by Usagi, but I can also see her being a coordinator instead of a gym leader.
Because I can see Usagi as a fairy specialist, Ami as a water/ice specialist, Rei as a fire specialist, Makoto as an electric specialist, and I'm not quite sure about Minako. Mythology says she should be a steel type specialist, given that fairy is already taken by Usagi, but I can also see her being a coordinator instead of a gym leader.