Your choice of starter Pokémon sets the tone for your early game. Here are recommended builds for their final evolutions:

Torterra (Grass/Ground)
- Nature: Adamant (+Atk, -Sp.Atk) or Impish (+Def, -Sp.Atk)
- Ability: Overgrow (Boosts Grass moves when HP is low)
- Held Item: Leftovers, Miracle Seed, Yache Berry
- Moveset:
- Wood Hammer (STAB, powerful Grass move)
- Earthquake (STAB, powerful Ground move)
- Stone Edge / Rock Slide (Coverage against Flying/Ice)
- Synthesis / Leech Seed (Recovery/Support)
Infernape (Fire/Fighting)
- Nature: Jolly (+Spe, -Sp.Atk) or Naive (+Spe, -Sp.Def) for mixed
- Ability: Blaze (Boosts Fire moves when HP is low)
- Held Item: Life Orb, Expert Belt, Focus Sash
- Moveset:
- Flare Blitz (STAB, powerful Fire move)
- Close Combat (STAB, powerful Fighting move)
- Mach Punch (Priority Fighting move) / U-turn (Momentum)
- Thunder Punch / Stone Edge / Grass Knot (Coverage)
Empoleon (Water/Steel)
- Nature: Modest (+Sp.Atk, -Atk) or Calm (+Sp.Def, -Atk)
- Ability: Torrent (Boosts Water moves when HP is low)
- Held Item: Choice Specs, Leftovers, Wacan Berry
- Moveset:
- Surf / Hydro Pump (STAB, powerful Water move)
- Flash Cannon (STAB, powerful Steel move)
- Ice Beam (Coverage against Grass/Dragon)
- Grass Knot / Aqua Jet (Coverage/Priority)
These builds focus on maximizing their natural strengths and providing good type coverage for in-game challenges.