If you do not know what set it is running (which in groudons case meaning revealing all 4 moves or a choice item), you cannot stay in/switch in to anything that cannot live vcreate. even if it has shown boomburst and judgment and some other special move. without vcreate you dont need resist on top of fur coat to take it, just one of the two. It is in this list that the new counters and ones not weak to those different kinds of coverages find themselves. things like regigigas and audino dont fear groudon without vcreate at all. so I m not sure what to prepare for 1 line responses in addition, groudon even without vcreate is still more overpowered than mewtwo, rayquaza and kyogre, because it is the only one with fully functional complementary dual stabs plus a defensive typing. mewty and kyogre have only 1 stab each, and both of rayquazas are both walled by steel and diancie among others. mewtx dont even have useable stabs without boosting. mewtwo and rayquaza cannot be self improof at all since their typings dont offer useful resists, while groudon has a ton of those, including 2 crucial ones to ates. groudons stabs dont even share 1 resistance in common, and with arrows none at all. this means even just a basic stab+shell smash set works better than any other of these pokemon.