* Fighting: Fighting-type moves like Low Kick, Brick Break, and Karate Chop deal double damage to Rock-type Pokémon.
* Grass: Grass-type moves like Razor Leaf, Vine Whip, and Solar Beam are super effective against Rock-type Pokémon.
* Water: While not super effective, Water-type moves like Bubblebeam, Hydro Pump, and Surf can still do decent damage.
Pokémon you can use to take advantage of these weaknesses:
* Fighting: Hitmonchan, Hitmonlee, Poliwrath, Primeape
* Grass: Venusaur, Bulbasaur, Ivysaur, Oddish, Gloom, Vileplume, Bellsprout, Weepinbell, Victreebel
* Water: Blastoise, Squirtle, Wartortle, Psyduck, Golduck, Seaking
Important Note: In Pokémon Indigo, type matchups are the main factor in determining effectiveness. However, other factors like individual Pokémon stats, moves, and training level can also impact the outcome of a battle.