Learnt by Level Up

These Pokémon learn Synthesis at the level specified

Name ⇧⇩	Level ⇧⇩	Type ⇧⇩
Bulbasaur	39	grass poison
Ivysaur	47	grass poison
Venusaur	53	grass poison
Chikorita	22	grass
Bayleef	23	grass
Meganium	23	grass
Hoppip	1	grass flying
Skiploom	1	grass flying
Jumpluff	1	grass flying
Sunkern	31	grass
Seedot	21	grass
Roselia	57	grass poison
Tropius	47	grass flying
Turtwig	33	grass
Grotle	37	grass
Torterra	39	grass ground
Leafeon	29	grass
Shaymin Land	28	grass
Petilil	17	grass
Lilligant	1	grass
Maractus	15	grass
Foongus	35	grass poison
Amoonguss	35	grass poison
Skiddo	20	grass
Gogoat	20	grass
Rowlet	25	grass flying
Dartrix	28	grass flying
Decidueye	28	grass ghost
Fomantis	28	grass
Lurantis	28	grass
Comfey	28	fairy
Kartana	19	grass steel
Gossifleur	24	grass
Eldegoss	28	grass
Zarude	66	dark grass
Brute Bonnet	21	grass dark
Venusaur Mega	45	grass poison
Lurantis Totem	28	grass
Zarude Dada	66	dark grass
Lilligant Hisui	1	grass fighting
Decidueye Hisui	20	grass fighting

Learnt through Breeding (Egg Moves)

These Pokémon learn Synthesis through Breeding (Egg Moves) at the level specified

Name ⇧⇩	Level ⇧⇩	Type ⇧⇩
Oddish	0	grass poison
Bellsprout	0	grass poison
Exeggcute	0	grass psychic
Treecko	0	grass
Lotad	0	water grass
Budew	0	grass poison
Carnivine	0	grass
Deerling	0	normal grass
Chespin	0	grass
Bounsweet	0	grass
Smoliv	0	grass normal