You have to find/buy the TM Bullet Seed and teach it to the Treecko...
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The final level, 100. You'll need some real elbow grease to get SHAYMIN to learn this move, but I'm sure you can do it! Hope this helps! :)
Breed a male torterra or venusaur that know leech seed with female sceptile and voila treeko that knows leech seed
Roselia can learn: Grasswhistle Ingrain Giga Drain Toxic Magical Leaf Petal Dance (note: Roselia cannot learn this move as Roserade) Stun Spore Aromatheropy Mega Drain Synthisis Grass Knot Bullet Seed Toxic Spikes Hidden Power Pin Missile Solarbeam Sunny Day Absorb Return Flash Growth Protect Attract Poison Sting Frustration Rest Leech Seed Facade Secret Power Sweet Scent Shadow Ball Sludge Bomb
heres a list of Pokemon that can learn leech seed via level up: Bulbasaur Ivysaur Venusaur Exeggute Hoppip Skiploom Jumpluff Sunkern Sunflora Shroomish Breloom Roselia Cacnea Cacturne Turtwig Grotle Torterra Cherubi Cherrim Any Pokemon would work, but Bulbasaur learns it fastest (lvl. 7)
there IS no TM seed flare. Only a lvl 100 shaymin can learn that move, and i seriously doubt that you have one of those.