Your mission is to challenge-and defeat-all 8 gym leaders, one at a time. As you collect Trainer badges and earn respect among PokÃ©mon and trainers alike, you will travel through deep, dark caves and across vast oceans and plains. Keep your eyes peeled as you go-some PokÃ©mon only show up in certain areas and some come out only at certain times of the day or night. And some PokÃ©mon can only be hatched, so you'll want to match them wisely to ensure that they produce eggs. Defeating gym leaders is not your only challenge. You must also fill up your PokÃ©dex and unravel all the mysteries in the land of Johto.