What? Munna on the bottom? Nowai. It is a frickin TANK. A bit from a lvl 27 Mightyena(yes, I use DW pokemon in mai playthru :3) against Bianca's Musharna did under 1/3 of damage. AND it had Defense Curl. AND Hypnosis. AND Lucky Chant. Munna is definitely sturdy enough to be high tier ingame.
Because there are a massive amount of Dark Types, and Munna's level-up movepool is Mono-Psychic?
Who cares if youre bulky. You're not gonna win when all you can do is sleep the foe.
Munna is also outclassed by all the other Psychics. Even Swoobat, because it actually gets type coverage.
Oh, and whoever is saying Lilligant needs to set up... no. While it might need to as Petilil [Mega Drain will probobly be your main attack, combined with Sleep Powder, and possibly Leech Seed], Lilligant needs no such thing.
If you evolve Petilil at Lv 26, which is what you should be aiming for, you wind up with this:
Base 110 Sp.Attack, hardly needs a set-up.
Base 90 speed, so you'll outspeed a large portion of the game.
70/75/75 defenses, which is
not bad.
Sleep Powder AND Giga Drain, a BP 75 STAB which heals you.
Quiver Dance in two levels.
Hopefully a decent HP type. The IGT one in Black has Ground 40, which takes care of Steels and Poisions. Mine in-game had HP Grass <_<
You see, that's the beauty of Lilligant. It can outright OHKO loads of things, and, if need be, against trainers who have multiple types, or if needed to be used against something that resists Grass, it can just throw Sleep Powder, and set up to destroy everything.
The only thing that stops it is the Deerling line and Afrobulls who have Sap Sipper.
TL;DR:
Lilligant needs little to no setup, unlike every other Grass type.
Lilligant an muscle past resisters.
The only Grass-types who come close are SimiSage, who is pretty bad until Seed Bomb, and Deerling [If only due to Jump Kick]