You want a Breloom hunh? Well, catch a Shroomishin Petalburg Woods or anywhere else and train it until it evolves. If I can remember correctly, it should evolve anytime before it hits Level 40, so if possible, give your Shroomish the EXP share and take your bestPokemon to the Elite Four and fight them over and over until he levels - If you can't do the Elite Four then just find trainers, and the best trainers for training are Breeders, but any will do. - Breloom is a very useful Pokemon as it has control over considerably powerful moves.
Breloom = Under Level 40
Shroomish evolve into Breloom at level 23
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The first fighting pokemon you can encounter in Ruby is in the cave at the island with the second gym. That one is makuhita. You can also catch a Shroomish in the forest south of Rustboro. Shroomish evolves into Breloom who is a grass/fighting type.
Wattson is easy as long as you have a ground type Pokemon like Marshtomp and use ground type moves like mud shot or have a grass type Pokemon like Grovyle or Breloom.
Shroomish and Breloom.
In Pokémon Emerald, Shroomish will evolve into Breloom at Level 23.
Pokemon Ruby has Pokemon that Pokemon Sapphire does not and Pokemon Sapphire has Pokemon that Pokemon Ruby does not.