If they add more moves, I want more utility/technical moves in general. Attacks with added boons or disadvantages to using them, and more conditional "if this, then..." moves.
Specifically in grass it makes sense. It's not a very good attacking type, but I always liked playing with grass types because you get to play with things like status effects, leech seed, draining moves, etc. Do we really need more moves that are the same as what we already have, but with a different name? Why was Leafage not at least made a special move, rather than physical, for example? I don't think we needed another standard low level grass attack, but they could have at least made it not exactly the same a vine whip.