Where are all 8 badges

Easy! They are in the gyms of Johto.

Falkner: First badge- Violet City= BIRD POKEMON
Bugsy: Second badge- Azalea Town= BUG POKEMON
Whitney: Third badge- Goldenrod City= NORMAL POKEMON
Morty: Fourth badge- Ecruteak City= GHOST POKEMON
Chuck: Fifth badge- Cianwood City= FIGHTING POKEMON
Jasmine: Sixth badge- Olivine City= STEEL POKEMON
Pryce: Seventh badge- Mahogany Town= ICE POKEMON
Clair: Eighth badge- Blackthorn City= DRAGON POKEMON

Except, you cannot get the Blackthorn badge until you get past the dragons den...

Elite four and the champion!

Elite four are found in Kanto, first you must get past Victory road then your at Indigo Plateau and THEN the Pokemon league, where the elite four are waiting for you.

Will: First Elite Four trainer= PSYCHIC POKEMON
Koga: Second Elite four trainer= POISON POKEMON
Bruno: Third Elite Four trainer= FIGHTING POKEMON
Karen: Fourth Elite Four Trainer= DARK POKEMON
Lance: Champion= DRAGON POKEMON

They are hard to beat. Ice Pokemon are very good on them, especially on Champion Lance.