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Meganium is a Grass Pokémon. It is vulnerable to Flying, Poison, Bug, Fire and Ice moves. Meganium's strongest moveset is Vine Whip & Frenzy Plant and it has a Max CP of 2,410.
"The fragrance of Meganium's flower soothes and calms emotions. In battle, this Pokémon gives off more of its becalming scent to blunt the foe's fighting spirit."
Meganium has basically one moveset, and this is it. Vine Whip is preferred over Razor Leaf due to its high energy generation letting it effectively leverage its powerful charged moves.
If you don't have a Meganium with Frenzy Plant, you don't have a Meganium. This Grass-type move is both cheap and hard-hitting, and is one of the biggest reasons for Meganium's power. The other reason is, of course, Earthquake. This Ground-type coverage leaves Meganium in the unique position of being able to handle Steel-types that wall most other Grasses, and it's super useful!
Important note: Frenzy Plant and Earthquake have the same effective base power thanks to Frenzy Plant getting STAB. This means that in any neutral scenario, Frenzy Plant is the better move. Do not use Earthquake unless there's at least a 1-stage difference in super effectiveness.
Meganium is one of Great League's top threats. While it's completely walled out by Flying-types, its bulk combined with its fantastic coverage gives it a great matchup against a lot of the format, and absolutely worth adding to your Great League roster!
The Level 50 update has let Meganium actually reach 2500 CP, making it significantly stronger than before in the Ultra League. While the dual Grass/Ground coverage is less useful here than it is in Great League, Meganium's certainly still useful if you can pull together all the XL candy it would require.
Meganium's low max CP makes it completely noncompetitive in the Master League.
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