Ninja, 3 grass-types is ultra risky as with sun, anything with a Fire-type move will eat you alive. Exeggutor and Venusaur seem a little bit the same if you ask me, so maybe drop one. Also, I like your Jumpluff but you still don't have any entry hazard so it's not as good as that. You also lack a strong physical attacker. In the sun, I'd suggest Sawsbuck or Victreebel (I'd go for Saws hands down, that thing is part of the fantasitc four of my team together with Ninetales, Typhlosion and Tornadus) for Grass-types, and Darmanitan, Infernape, Blaziken or Arcanine for Fire-types that get powered up by the sun.