You'll get strength after you go through Destul town.
A karate man in the desert gives it to you.
Heracross is amazing, I was training a Mankey, but after finding Heracross, I changed them. Ampharos' Thunderbolt is deadly, and Venusaur is grat with Leech Seed and Sleep Powder.
When you enter the Victory Road for the first time, where the lv 17-18 Fire-types are, and go to the next route, I found a Karate expert with 5 Lv 60 Pokémon (The Hitmons, Machamp and Heracross) Luckily, he was silly, and I managed to use Leech Seed and Sleep Powder to beat them, with my Lv 34 Venusaur! Are you supposed to be able to battle such a strong trainer so early in the game?
Hmm that fire cave actually isnt victory road, its just a part of the cave i used that had the same name, and I couldn't get it to not show the name since it's a cave. But which route is this karate expert on?
Yeah sure, anyone can do a walkthrough if they want.
Just try not to bash my game too much