Treecko

Treecko is a Grass type Pokemon and the Grass type starter in Hoenn, introduced in Generation III. Treecko can be chosen at the beginning of the player's adventure in Pokemon Ruby and Sapphire, Pokemon Emerald Version and Pokemon Omega Ruby and Alpha Sapphire.

Treecko evolves into Grovyle starting at level 16 and into Sceptile starting at level 36.

Since the fourth and sixth Hoenn Gym Leaders specialize in Fire and Flying type Pokemon respectively, the Grass type Starter wouldn't be able to battle since Grass is weak to both types. The first Gym Leader will be easy to battle since Grass types have a strength and specializes in Rock types.

Trivia

 * Along with Mudkip and Torchic, Treecko is one of the starters from the Hoenn region.