Grass-types are no longer affected by powder moves, while it sounds like a great thing the Roserade family is affected by it. :'(
The Frozen condition is rare, she couldn't stand the Ice-type moves for too long anyway. While only a few people are willing to burn her, as its not that wortg it; she is mostly a S. Attacker. It's obvious she isn't affected by the Poison related problem. That only leaves her to paralysis.
Technician is supposed to be a great Ability, but this is one of those unfortunate mismatch cases. :( What is she suppose to learn beside Magical Leaf and Sleep Powder? (Leaf Storm is also the obvious choice between Magical Leaf.)
That reminds me of Leaf Guard, which is Roselia and tge Chikorita line's HA.
Leaf Guard isn't great either… in fact it's one of the worse Ability out there, for some reason it isn't working like it's counterpart, Hydration. :/ If it works similarly with Hydration, they could spam the LG, Rest/Synthesis, Solar Beam and HP Fire. :')