Gym Challenge Pokémon You were endorsed into the gym challenge you have to collect 9 gym badges from different gym leader to go to the semifinals and to get into the finals to get the chance to defeat champion Leon, first you have to defeat the gym leaders, first milo grass type gym leader, then Nessa water type, then kabu fire type, then Allister ghost type, then opel fairy type, then Melony ice type, then piers dark type, then Raihan dragon type after that you have to defeat them again