Welcome to the Club!
Treecko is my favourite Starter as well and the Shiny Colours look great on all 3 stages with my favourite of the three being the small Wood Gecko Pokémon himself. :)
How about a new sub-topic?
If you were going to play a Grass Monotype, what would your team consist of and what moves would each one have? I wanna hear some answers before I give mine!;)
I have played several Grass Monotypes already and have completed a Grass Monotype in Red, Heart Gold, Pearl, White 2 and Y so far and am currently doing a Grass Monotype of White. :)
Team:
Vileplume - The Rafflesia Pokémon has been the star of two Monotypes (Red and Heart Gold) and has been always reliable and able to take a hit too.
Moveset - Petal Dance, Sludge Bomb, Grassy Terrain, Toxic.
Roserade - Weather Ball is an excellent move in any Monotype and with TMs being reusable in Gens 5 and 6 she can hit practically any threat. Sludge Bomb and Petal Dance as well. Star of my Pearl Monotype.
Moveset - Rain Dance/Sunny Day, Sludge Bomb/Dazzling Gleam, Weather Ball, Petal Dance
Sceptile - A fast Pokémon on a largely slow team. Also a Physical Attacker and potential Mega.
Moveset - Leaf Blade, Outrage, X Scissor, Swords Dance.
Lilligant - Sleep Powder, Quiver Dance, Petal Dance. She was the star in my White 2 Monotype and I was not going to leave my favourite Pokemon out.
Moveset - Sleep Powder, Petal Dance, Quiver Dance, Dream Eater.
Trevenant - Ghost Typing gives type coverage and also learns Psychic to deal with Poison Types. Also a Physical Attacker.
Moveset - Wood Hammer, Psychic, Shadow Claw, Forests Curse
Breloom - Fighting Typing to deal with Ice Types along with Dark Types and gets Spore too. The Mushroom Pokémon was very useful in my White 2 Monotype.
Moveset - Spore, Sky Uppercut, Seed Bomb, Focus Punch