Victreebell moveset

Depends on whether you have enough grass pokemon to take down opposing gyms besides exeggutor or venusaur. I have a similar victreebel which was originally hatched and evolved with the same moveset but I never powered it up. Instead I use it for prestige purposes to get the most points possible. Up to 1000 against a rhydon double its CP.

Leaf Blade is spammable and might even have potential on defense. As everyone is saying, wait for the rework. Charging SoB takes time and the 'mon can be beaten before it has the chance to fire it.

Personally, I won't. There are stronger and/or tougher Pokémons to use other than Victreebell. I'd rather keep its CP to prestiging range.

However, the best moveset should be
Razor Leaf / Solar Beam.

Says who? GamePress rates both Razor Leaf/Solar Beam and Razor Leaf/Leaf Blade as "A" attacking movesets (you don't want to use Victreebel on Defense).