I love Snivy, I wish it could be legally balled
meh I'll probably breed an illegal one later.
Set 2 you should Swap Grassy Terrain for Natural Gift. Gives it an extra coverage move once which could suprise one of its likely many switch ins.
Set one should have Mean Look over Magical Leaf solely b/c Grassy Terrain+Leech Seed you can lock something in that cant touch you and stall them out or something and Magical Leaf is a bit too weak. Honestly its worth fitting Glare in there too as its the most likely to run Sub Seed and Glare can fit in quite well.