Breloom (B+/A-)
~ Useful Moves: Spore, Mach Punch, Force Palm, Sky Uppercut, Seed Bomb, Bullet Seed (Breed), Bulk Up , Drain Punch (Breed)
~ Abilities: Poison Heal or Technician. I forget if a Toxic Orb is available so take that with a grain of salt. Techinican boosts many moves (Force Palm, Mach Punch, and Bullet Seed).
~ Obtainable: Before Gym #4 (Mystery Egg), Before Gym #6 (Special Tree @ Akora Forest).
*Gym by Gym Usefulness*
~ Closest HM to "useful" is Rock Smash, however; this move is lower in power compared to Force Palm. I would not recommend HMs on Breloom.
~ Very high Attack (130) and semi-decent Speed (70).
~ Extremely frail.
~ Unable to use Move Re-learner until after Gym #7 so no leveling for Spore until then.
~ B+ before Gym #7, A- for future content.
~ Very useful for Legendary Battles.