Thank you, I've wanted to beat Terra and this is the only way since my pokemon were underleveled and the stupid quagsire. In the case, I wanted to set up trick room and use 2 pokemon for toxic spikes and then send out shedinja to defeat the nidoking and let the toxic spikes badly poison the others and use sunny day when hippowdon appears and basically stall her to death. Although the only problem would be excadrill, but I think I can defeat her using the strat simce only poison type pokemon can absorb the toxic spikes and steels types are just immuned to the spikes and won't absorb the toxic spikes.