Match toward the Cascade badge

After defeating Brock, that guy who blocked you will let you pass. Heading toward Mt. Moon, Route 3 has some Jigglypuff. They are rare and you have 1 out of 20 chance of finding one. Trainers there are great to battle and will help level up your pokemon. There is a rest stop near Mt. Moon. In Mt. Moon, look out for Clefairy. Chance of finding one is 1 out of 75. Zubat are found alot, and geodude. Chance of finding a geodude is 1 out of 10. Find a escape rope and a tm. Look out for rare candy near the fossils. Look for a Moon Stone too, Moon stones evolve Clefairy, nidorina and nidorino. The fossils can get you either Omanyte or Kabuto. After exiting Mt. Moon, two guys will be outside. Theycan teach you pokemon mega punch or mega kick once. If you decide not to use them, you can't go back until you can fly. Next you will be at Cerulean city. Don't battle Misty just yet, head north towards Nugget Bridge. You will battle you rival. You will also get a item. Head up and defeat everyone on nugget bridge. Earn a nugget. Then, in the grass you can find abras, meowth, oddish (fire red) or bellsprout ( leaf green). Head east now and keep going. I recommend to battle the trainers along the ways. At the ends, talk to Bill. Then, head South to battle Misty.

Your rival pokemon are gonna be around 16. (can't remmenber, sorry.)

Misty has Staryu and Starmie. Defeat her and get a Cascade badge.

My Pokemon I had here were lv32 Ivysaur, lv32 Pidgeotto, lv29 Kadabra.