Victreebel

Victreebel is a very solid budget attacker that can pull double-duty as a Grass or Poison-Type, but it's completely outclassed in both. In fact, Roserade is basically a better version of Victreebel, as it sports the same typing and better offensive presence in both Grass and Poison.

Best PvE Offensive Moveset

• Magical Leaf* is ideal for Victreebel’s role as Water and Rock-type slayer.

• Razor Leaf is okay, but it definitely falls behind Magical Leaf.

• Solar Beam and Leaf Blade are both stellar charge moves. Solar Beam has higher DPS on paper, but Leaf Blade performs better in practice.

• Acid can be paired with Sludge Bomb to take on Fairy types or other Grass Types.
• Leaf Tornado and Acid Spray perform poorly in gyms and raids.

Best PvE Defensive Moveset

• Magical Leaf* is Victreebel's best Fast Move on defense. It's basically a better version of Razor Leaf, and is better than Acid even if resisted.

• Despite having the same type as Victreebel's Fast Move, Leaf Blade is arguably the best Charged Move choice, as it comes out frequently and is hard to dodge.

• Sludge Bomb is also worth considering, as it has different coverage and decent parameters on defense.

• Leaf Tornado, Acid Spray, and Solar Beam all fall behind on defense.

Magical Leaf* is a great move in PvP thanks to its above average energy generation and damage output alike, making it a strong all-around pick that tends to out-pace Razor leaf's DPS-centric stat-line. Leaf Blade, then, pairs with it fantastically due to its low energy cost. Sludge Bomb is a strong Poison-type move that can deal a ton of damage if unshielded. Acid Spray, on the other hand, makes the bet that your opponent is going to shield no matter what and reduces their defense significantly. This either allows Victreebel to hit even harder, or at least sets up a better farm for your next Pokémon.