U-Turn is a good move for that last slot for Jumpluff.
Crobat is also not bad for setting up Sunny Day (and runs a similar set to Jumpluff), being faster and bulkier than Jumpluff, and also having a reliable recovery with Roost. Also, Crobat's not as expected since it's neither grass or fire type. The bad thing is that it does have Rock / Ice weakness which is shared with most Fire / Grass Types (but Roost does get rid of those two weaknesses).
EDIT: k, I'm slow, sorry.
Crobat is also not bad for setting up Sunny Day (and runs a similar set to Jumpluff), being faster and bulkier than Jumpluff, and also having a reliable recovery with Roost. Also, Crobat's not as expected since it's neither grass or fire type. The bad thing is that it does have Rock / Ice weakness which is shared with most Fire / Grass Types (but Roost does get rid of those two weaknesses).
EDIT: k, I'm slow, sorry.