In Pokémon Sapphire, the moves that Treecko can learn through level-up would include moves such as Absorb at Level 6, Quick Attack at Level 11, Pursuit at Level 16, Screech at Level 21, Mega Drain at Level 26, Agility at Level 31, Slam at Level 36, Detect at Level 41and Giga Drain at Level 46 it will also have Pound and Leer as one of its moves once you have received it as a gift Pokémon from a regional Professor.
treecko
The only way is to start the game with Treecko as your starter.
Ruby, Sapphire and Emerald.
Trade it from Ruby,Sapphire,Or Emerald.
Treecko, Tropius, Seedot, Oddish.
Treecko, Torchic and Mudkip.
Torchic, Mudkip, and Treecko
trade it over from emerald or ruby and Sapphire
The three starters: Mudkip, Torchic, and Treecko.
202 (Treecko - Deoxys)
Treecko or Mudkip. So do you liek mudkipz?
You can receive a Treecko from Professor Birch in Pokemon Ruby, Sapphire or Emerald. To get it in other games you must trade it as it cannot be found in the wild.